diff --git a/shell/platform/darwin/ios/framework/Source/FlutterEnginePlatformViewTest.mm b/shell/platform/darwin/ios/framework/Source/FlutterEnginePlatformViewTest.mm
index 51c76156b4f98..d63d7c4d898ad 100644
--- a/shell/platform/darwin/ios/framework/Source/FlutterEnginePlatformViewTest.mm
+++ b/shell/platform/darwin/ios/framework/Source/FlutterEnginePlatformViewTest.mm
@@ -73,7 +73,9 @@ - (void)setUp {
                                /*io=*/thread_task_runner);
   platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/fake_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/fake_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
@@ -91,8 +93,13 @@ - (void)tearDown {
 }
 
 - (void)testMsaaSampleCount {
-  // Default should be 1.
-  XCTAssertEqual(platform_view->GetIosContext()->GetMsaaSampleCount(), MsaaSampleCount::kNone);
+  if (fake_delegate.settings_.enable_impeller) {
+    // Default should be 4 for Impeller.
+    XCTAssertEqual(platform_view->GetIosContext()->GetMsaaSampleCount(), MsaaSampleCount::kFour);
+  } else {
+    // Default should be 1 for Skia.
+    XCTAssertEqual(platform_view->GetIosContext()->GetMsaaSampleCount(), MsaaSampleCount::kNone);
+  }
 
   // Verify the platform view creates a new context with updated msaa_samples.
   // Need to use Metal, since this is ignored for Software/GL.
diff --git a/shell/platform/darwin/ios/framework/Source/FlutterPlatformViewsTest.mm b/shell/platform/darwin/ios/framework/Source/FlutterPlatformViewsTest.mm
index c55111136df9b..a149fb422ca8f 100644
--- a/shell/platform/darwin/ios/framework/Source/FlutterPlatformViewsTest.mm
+++ b/shell/platform/darwin/ios/framework/Source/FlutterPlatformViewsTest.mm
@@ -90,6 +90,7 @@ @implementation FlutterPlatformViewsTestMockFlutterPlatformFactory
 namespace flutter {
 namespace {
 class FlutterPlatformViewsTestMockPlatformViewDelegate : public PlatformView::Delegate {
+ public:
   void OnPlatformViewCreated(std::unique_ptr<Surface> surface) override {}
   void OnPlatformViewDestroyed() override {}
   void OnPlatformViewScheduleFrame() override {}
@@ -118,7 +119,6 @@ void LoadDartDeferredLibraryError(intptr_t loading_unit_id,
   void UpdateAssetResolverByType(std::unique_ptr<flutter::AssetResolver> updated_asset_resolver,
                                  flutter::AssetResolver::AssetResolverType type) override {}
 
- private:
   flutter::Settings settings_;
 };
 
@@ -149,11 +149,13 @@ - (void)testFlutterViewOnlyCreateOnceInOneFrame {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -205,11 +207,13 @@ - (void)testCanCreatePlatformViewWithoutFlutterView {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -259,11 +263,13 @@ - (void)testApplyBackdropFilter {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -331,11 +337,13 @@ - (void)testApplyBackdropFilterWithCorrectFrame {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -403,11 +411,13 @@ - (void)testApplyMultipleBackdropFilters {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -476,11 +486,13 @@ - (void)testAddBackdropFilters {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -589,11 +601,13 @@ - (void)testRemoveBackdropFilters {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -726,11 +740,13 @@ - (void)testEditBackdropFilters {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -1003,11 +1019,13 @@ - (void)testApplyBackdropFilterNotDlBlurImageFilter {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -1303,11 +1321,13 @@ - (void)testCompositePlatformView {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -1359,11 +1379,13 @@ - (void)testBackdropFilterCorrectlyPushedAndReset {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -1453,11 +1475,13 @@ - (void)testChildClippingViewShouldBeTheBoundingRectOfPlatformView {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -1524,11 +1548,13 @@ - (void)testClipsDoNotInterceptWithPlatformViewShouldNotAddMaskView {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -1591,11 +1617,13 @@ - (void)testClipRRectOnlyHasCornersInterceptWithPlatformViewShouldAddMaskView {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -1657,11 +1685,13 @@ - (void)testClipRect {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -1730,11 +1760,13 @@ - (void)testClipRRect {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -1803,11 +1835,13 @@ - (void)testClipPath {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -1877,11 +1911,13 @@ - (void)testSetFlutterViewControllerAfterCreateCanStillDispatchTouchEvents {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -1941,11 +1977,13 @@ - (void)testSetFlutterViewControllerInTheMiddleOfTouchEventShouldStillAllowGestu
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -2062,11 +2100,13 @@ - (void)testSetFlutterViewControllerInTheMiddleOfTouchEventShouldStillAllowGestu
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -2173,11 +2213,13 @@ - (void)testFlutterPlatformViewTouchesCancelledEventAreForcedToBeCancelled {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -2235,11 +2277,13 @@ - (void)testFlutterPlatformViewControllerSubmitFrameWithoutFlutterViewNotCrashin
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -2297,11 +2341,13 @@ - (void)testFlutterPlatformViewControllerSubmitFrameWithoutFlutterViewNotCrashin
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   UIView* mockFlutterView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 500, 500)] autorelease];
   flutterPlatformViewsController->SetFlutterView(mockFlutterView);
@@ -2347,11 +2393,13 @@ - (void)testFlutterPlatformViewControllerBeginFrameShouldResetCompisitionOrder {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   UIView* mockFlutterView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 500, 500)] autorelease];
   flutterPlatformViewsController->SetFlutterView(mockFlutterView);
@@ -2403,11 +2451,13 @@ - (void)testFlutterPlatformViewControllerBeginFrameShouldResetCompisitionOrder {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   UIView* mockFlutterView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 500, 500)] autorelease];
   flutterPlatformViewsController->SetFlutterView(mockFlutterView);
@@ -2501,11 +2551,13 @@ - (void)testFlutterPlatformViewControllerBeginFrameShouldResetCompisitionOrder {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   UIView* mockFlutterView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 500, 500)] autorelease];
   flutterPlatformViewsController->SetFlutterView(mockFlutterView);
@@ -2599,11 +2651,13 @@ - (void)testThreadMergeAtEndFrame {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   UIView* mockFlutterView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 500, 500)] autorelease];
   flutterPlatformViewsController->SetFlutterView(mockFlutterView);
@@ -2753,11 +2807,13 @@ - (void)testClipMaskViewIsReused {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -2835,11 +2891,13 @@ - (void)testDifferentClipMaskViewIsUsedForEachView {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
@@ -2935,11 +2993,13 @@ - (void)testDisposingViewInCompositionOrderDoNotCrash {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   UIView* mockFlutterView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, 500, 500)] autorelease];
   flutterPlatformViewsController->SetFlutterView(mockFlutterView);
@@ -3043,11 +3103,13 @@ - (void)testOnlyPlatformViewsAreRemovedWhenReset {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_jsync_switch=*/std::make_shared<fml::SyncSwitch>());
 
   FlutterPlatformViewsTestMockFlutterPlatformFactory* factory =
       [[[FlutterPlatformViewsTestMockFlutterPlatformFactory alloc] init] autorelease];
diff --git a/shell/platform/darwin/ios/framework/Source/accessibility_bridge_test.mm b/shell/platform/darwin/ios/framework/Source/accessibility_bridge_test.mm
index 5b75abf8a4b6b..916153db683f6 100644
--- a/shell/platform/darwin/ios/framework/Source/accessibility_bridge_test.mm
+++ b/shell/platform/darwin/ios/framework/Source/accessibility_bridge_test.mm
@@ -73,6 +73,7 @@ @implementation MockFlutterPlatformFactory
 namespace flutter {
 namespace {
 class MockDelegate : public PlatformView::Delegate {
+ public:
   void OnPlatformViewCreated(std::unique_ptr<Surface> surface) override {}
   void OnPlatformViewDestroyed() override {}
   void OnPlatformViewScheduleFrame() override {}
@@ -101,7 +102,6 @@ void LoadDartDeferredLibraryError(intptr_t loading_unit_id,
   void UpdateAssetResolverByType(std::unique_ptr<flutter::AssetResolver> updated_asset_resolver,
                                  flutter::AssetResolver::AssetResolverType type) override {}
 
- private:
   flutter::Settings settings_;
 };
 
@@ -147,11 +147,13 @@ - (void)testCreate {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   auto bridge =
       std::make_unique<flutter::AccessibilityBridge>(/*view=*/nil,
                                                      /*platform_view=*/platform_view.get(),
@@ -169,11 +171,13 @@ - (void)testUpdateSemanticsEmpty {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController viewIfLoaded]).andReturn(mockFlutterView);
@@ -198,11 +202,13 @@ - (void)testUpdateSemanticsOneNode {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -245,11 +251,13 @@ - (void)testIsVoiceOverRunning {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -277,11 +285,13 @@ - (void)testSemanticsDeallocated {
         std::make_shared<flutter::FlutterPlatformViewsController>();
     auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
         /*delegate=*/mock_delegate,
-        /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+        /*rendering_api=*/mock_delegate.settings_.enable_impeller
+            ? flutter::IOSRenderingAPI::kMetal
+            : flutter::IOSRenderingAPI::kSoftware,
         /*platform_views_controller=*/flutterPlatformViewsController,
         /*task_runners=*/runners,
         /*worker_task_runner=*/nil,
-        /*is_gpu_disabled_sync_switch=*/nil);
+        /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
     id mockFlutterView = OCMClassMock([FlutterView class]);
     id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
     OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -336,11 +346,13 @@ - (void)testSemanticsDeallocatedWithoutLoadingView {
         std::make_shared<flutter::FlutterPlatformViewsController>();
     auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
         /*delegate=*/mock_delegate,
-        /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+        /*rendering_api=*/mock_delegate.settings_.enable_impeller
+            ? flutter::IOSRenderingAPI::kMetal
+            : flutter::IOSRenderingAPI::kSoftware,
         /*platform_views_controller=*/flutterPlatformViewsController,
         /*task_runners=*/runners,
         /*worker_task_runner=*/nil,
-        /*is_gpu_disabled_sync_switch=*/nil);
+        /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
 
     MockFlutterPlatformFactory* factory = [[[MockFlutterPlatformFactory alloc] init] autorelease];
     flutterPlatformViewsController->RegisterViewFactory(
@@ -381,11 +393,13 @@ - (void)testReplacedSemanticsDoesNotCleanupChildren {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id engine = OCMClassMock([FlutterEngine class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   FlutterView* flutterView = [[FlutterView alloc] initWithDelegate:engine
@@ -475,11 +489,13 @@ - (void)testScrollableSemanticsDeallocated {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id engine = OCMClassMock([FlutterEngine class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   FlutterView* flutterView = [[FlutterView alloc] initWithDelegate:engine
@@ -547,11 +563,13 @@ - (void)testBridgeReplacesSemanticsNode {
   auto flutterPlatformViewsController = std::make_shared<flutter::FlutterPlatformViewsController>();
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/flutterPlatformViewsController,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id engine = OCMClassMock([FlutterEngine class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   FlutterView* flutterView = [[FlutterView alloc] initWithDelegate:engine
@@ -619,11 +637,13 @@ - (void)testAnnouncesRouteChanges {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -687,11 +707,13 @@ - (void)testRadioButtonIsNotSwitchButton {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id engine = OCMClassMock([FlutterEngine class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   FlutterView* flutterView = [[FlutterView alloc] initWithDelegate:engine
@@ -734,11 +756,13 @@ - (void)testLayoutChangeWithNonAccessibilityElement {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -818,11 +842,13 @@ - (void)testLayoutChangeDoesCallNativeAccessibility {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -893,11 +919,13 @@ - (void)testLayoutChangeDoesCallNativeAccessibilityWhenFocusChanged {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -967,11 +995,13 @@ - (void)testScrollableSemanticsContainerReturnsCorrectChildren {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -1024,11 +1054,13 @@ - (void)testAnnouncesRouteChangesAndLayoutChangeInOneUpdate {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -1121,11 +1153,13 @@ - (void)testAnnouncesRouteChangesWhenAddAdditionalRoute {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -1207,11 +1241,13 @@ - (void)testAnnouncesRouteChangesRemoveRouteInMiddle {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -1299,11 +1335,13 @@ - (void)testHandleEvent {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -1343,11 +1381,13 @@ - (void)testAnnouncesRouteChangesWhenNoNamesRoute {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -1413,11 +1453,13 @@ - (void)testAnnouncesLayoutChangeWithNilIfLastFocusIsRemoved {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   id mockFlutterView = OCMClassMock([FlutterView class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -1482,11 +1524,13 @@ - (void)testAnnouncesLayoutChangeWithTheSameItemFocused {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   id mockFlutterView = OCMClassMock([FlutterView class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -1557,11 +1601,13 @@ - (void)testAnnouncesLayoutChangeWhenFocusMovedOutside {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   id mockFlutterView = OCMClassMock([FlutterView class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -1634,11 +1680,13 @@ - (void)testAnnouncesScrollChangeWithLastFocused {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   id mockFlutterView = OCMClassMock([FlutterView class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -1707,11 +1755,13 @@ - (void)testAnnouncesScrollChangeDoesCallNativeAccessibility {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   id mockFlutterView = OCMClassMock([FlutterView class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -1782,11 +1832,13 @@ - (void)testAnnouncesIgnoresRouteChangesWhenModal {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -1839,11 +1891,13 @@ - (void)testAnnouncesIgnoresLayoutChangeWhenModal {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -1901,11 +1955,13 @@ - (void)testAnnouncesIgnoresScrollChangeWhenModal {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -1971,11 +2027,13 @@ - (void)testAccessibilityMessageAfterDeletion {
 
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   fml::AutoResetWaitableEvent latch;
   thread_task_runner->PostTask([&] {
     auto weakFactory =
@@ -2006,11 +2064,13 @@ - (void)testFlutterSemanticsScrollViewManagedObjectLifecycleCorrectly {
                                /*io=*/thread_task_runner);
   auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
       /*delegate=*/mock_delegate,
-      /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+      /*rendering_api=*/mock_delegate.settings_.enable_impeller
+          ? flutter::IOSRenderingAPI::kMetal
+          : flutter::IOSRenderingAPI::kSoftware,
       /*platform_views_controller=*/nil,
       /*task_runners=*/runners,
       /*worker_task_runner=*/nil,
-      /*is_gpu_disabled_sync_switch=*/nil);
+      /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
   id mockFlutterView = OCMClassMock([FlutterView class]);
   id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
   OCMStub([mockFlutterViewController view]).andReturn(mockFlutterView);
@@ -2056,11 +2116,13 @@ - (void)testPlatformViewDestructorDoesNotCallSemanticsAPIs {
   thread_task_runner->PostTask([&] {
     auto platform_view = std::make_unique<flutter::PlatformViewIOS>(
         /*delegate=*/test_delegate,
-        /*rendering_api=*/flutter::IOSRenderingAPI::kSoftware,
+        /*rendering_api=*/test_delegate.settings_.enable_impeller
+            ? flutter::IOSRenderingAPI::kMetal
+            : flutter::IOSRenderingAPI::kSoftware,
         /*platform_views_controller=*/nil,
         /*task_runners=*/runners,
         /*worker_task_runner=*/nil,
-        /*is_gpu_disabled_sync_switch=*/nil);
+        /*is_gpu_disabled_sync_switch=*/std::make_shared<fml::SyncSwitch>());
 
     id mockFlutterViewController = OCMClassMock([FlutterViewController class]);
     auto flutterPlatformViewsController =
diff --git a/shell/platform/darwin/ios/ios_context.mm b/shell/platform/darwin/ios/ios_context.mm
index 007de7a7105fd..2f58ebb7479a0 100644
--- a/shell/platform/darwin/ios/ios_context.mm
+++ b/shell/platform/darwin/ios/ios_context.mm
@@ -2,14 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#import "flutter/shell/platform/darwin/ios/ios_context.h"
+#include "flutter/shell/platform/darwin/ios/ios_context.h"
+#include "flutter/shell/platform/darwin/ios/rendering_api_selection.h"
 
 #include "flutter/fml/logging.h"
-#import "flutter/shell/platform/darwin/ios/ios_context_software.h"
+#include "flutter/shell/platform/darwin/ios/ios_context_software.h"
 
 #if SHELL_ENABLE_METAL
-#import "flutter/shell/platform/darwin/ios/ios_context_metal_impeller.h"
-#import "flutter/shell/platform/darwin/ios/ios_context_metal_skia.h"
+#include "flutter/shell/platform/darwin/ios/ios_context_metal_impeller.h"
+#include "flutter/shell/platform/darwin/ios/ios_context_metal_skia.h"
 #endif  // SHELL_ENABLE_METAL
 
 namespace flutter {
@@ -25,6 +26,11 @@
     std::shared_ptr<const fml::SyncSwitch> is_gpu_disabled_sync_switch) {
   switch (api) {
     case IOSRenderingAPI::kSoftware:
+      FML_CHECK(backend != IOSRenderingBackend::kImpeller)
+          << "Software rendering is incompatible with Impeller.\n"
+             "Software rendering may have been automatically selected when running on a simulator "
+             "in an environment that does not support Metal. Enabling GPU pass through in your "
+             "environment may fix this. If that is not possible, then disable Impeller.";
       return std::make_unique<IOSContextSoftware>();
 #if SHELL_ENABLE_METAL
     case IOSRenderingAPI::kMetal: