Implement host sides of new API

packages/pigeon/platform_tests/alternate_language_test_plugin/android/src/main/java/com/example/alternate_language_test_plugin/AlternateLanguageTestPlugin.java

@@ -72,6 +72,11 @@ public byte[] echoUint8List(@NonNull byte[] aUint8List) {
     return aUint8List;
   }
 
+  @Override
+  public @NonNull Object echoObject(@NonNull Object anObject) {
+    return anObject;
+  }
+
   @Override
   public @Nullable String extractNestedNullableString(@NonNull AllNullableTypesWrapper wrapper) {
     return wrapper.getValues().getANullableString();
@@ -124,6 +129,11 @@ public byte[] echoUint8List(@NonNull byte[] aUint8List) {
     return aNullableUint8List;
   }
 
+  @Override
+  public @Nullable Object echoNullableObject(@Nullable Object aNullableObject) {
+    return aNullableObject;
+  }
+
   @Override
   public void noopAsync(Result<Void> result) {
     result.success(null);

packages/pigeon/platform_tests/alternate_language_test_plugin/ios/Classes/AlternateLanguageTestPlugin.m

@@ -63,6 +63,10 @@ - (nullable FlutterStandardTypedData *)echoUint8List:(FlutterStandardTypedData *
   return aUint8List;
 }
 
+- (nullable id)echoObject:(id)anObject error:(FlutterError *_Nullable *_Nonnull)error {
+  return anObject;
+}
+
 - (nullable NSString *)extractNestedNullableStringFrom:(AllNullableTypesWrapper *)wrapper
                                                  error:(FlutterError *_Nullable *_Nonnull)error {
   return wrapper.values.aNullableString;
@@ -114,6 +118,11 @@ - (nullable NSString *)echoNullableString:(nullable NSString *)aNullableString
   return aNullableUint8List;
 }
 
+- (nullable id)echoNullableObject:(nullable id)aNullableObject
+                            error:(FlutterError *_Nullable *_Nonnull)error {
+  return aNullableObject;
+}
+
 - (void)noopAsyncWithCompletion:(void (^)(FlutterError *_Nullable))completion {
   completion(nil);
 }

packages/pigeon/platform_tests/test_plugin/android/src/main/kotlin/com/example/test_plugin/TestPlugin.kt

@@ -64,6 +64,10 @@ class TestPlugin: FlutterPlugin, HostIntegrationCoreApi {
     return aUint8List
   }
 
+  override fun fun echoObject(anObject: Any): Any {
+    return anObject
+  }
+
   override fun extractNestedNullableString(wrapper: AllNullableTypesWrapper): String? {
     return wrapper.values.aNullableString
   }
@@ -75,22 +79,31 @@ class TestPlugin: FlutterPlugin, HostIntegrationCoreApi {
   override fun sendMultipleNullableTypes(aNullableBool: Boolean?, aNullableInt: Long?, aNullableString: String?): AllNullableTypes {
     return AllNullableTypes(aNullableBool = aNullableBool, aNullableInt = aNullableInt, aNullableString = aNullableString)
   }
+
   override fun echoNullableInt(aNullableInt: Long?): Long? {
     return aNullableInt
   }
+
   override fun echoNullableDouble(aNullableDouble: Double?): Double? {
     return aNullableDouble
   }
+
   override fun echoNullableBool(aNullableBool: Boolean?): Boolean? {
     return aNullableBool
   }
+
   override fun echoNullableString(aNullableString: String?): String? {
     return aNullableString
   }
+
   override fun echoNullableUint8List(aNullableUint8List: ByteArray?): ByteArray? {
     return aNullableUint8List
   }
 
+  override fun fun echoNullableObject(aNullableObject: Any?): Any? {
+    return aNullableObject
+  }
+
   override fun noopAsync(callback: () -> Unit) {
     callback()
   }

packages/pigeon/platform_tests/test_plugin/ios/Classes/TestPlugin.swift

@@ -59,6 +59,10 @@ public class TestPlugin: NSObject, FlutterPlugin, HostIntegrationCoreApi {
     return aUint8List
   }
 
+  func echoObject(anObject: Any) -> Any {
+    return anObject
+  }
+
   func extractNestedNullableString(wrapper: AllNullableTypesWrapper) -> String? {
     return wrapper.values.aNullableString;
   }
@@ -92,6 +96,10 @@ public class TestPlugin: NSObject, FlutterPlugin, HostIntegrationCoreApi {
     return aNullableUint8List
   }
 
+  func echoNullableObject(aNullableObject: Any?) -> Any? {
+    return aNullableObject
+  }
+
   func noopAsync(completion: @escaping () -> Void) {
     completion()
   }

packages/pigeon/platform_tests/test_plugin/macos/Classes/TestPlugin.swift

@@ -59,6 +59,10 @@ public class TestPlugin: NSObject, FlutterPlugin, HostIntegrationCoreApi {
     return aUint8List
   }
 
+  func echoObject(anObject: Any) -> Any {
+    return anObject
+  }
+
   func extractNestedNullableString(wrapper: AllNullableTypesWrapper) -> String? {
     return wrapper.values.aNullableString;
   }
@@ -92,6 +96,10 @@ public class TestPlugin: NSObject, FlutterPlugin, HostIntegrationCoreApi {
     return aNullableUint8List
   }
 
+  func echoNullableObject(aNullableObject: Any?) -> Any? {
+    return aNullableObject
+  }
+
   func noopAsync(completion: @escaping () -> Void) {
     completion()
   }

packages/pigeon/platform_tests/test_plugin/windows/test_plugin.cpp

@@ -73,6 +73,11 @@ ErrorOr<std::vector<uint8_t>> TestPlugin::EchoUint8List(
   return a_uint8_list;
 }
 
+ErrorOr<flutter::EncodableValue> TestPlugin::EchoObject(
+    const flutter::EncodableValue& an_object) {
+  return an_object;
+}
+
 ErrorOr<std::optional<std::string>> TestPlugin::ExtractNestedNullableString(
     const AllNullableTypesWrapper& wrapper) {
   const std::string* inner_string = wrapper.values().a_nullable_string();
@@ -153,6 +158,14 @@ ErrorOr<std::optional<std::vector<uint8_t>>> TestPlugin::EchoNullableUint8List(
   return *a_nullable_uint8_list;
 };
 
+ErrorOr<std::optional<flutter::EncodableValue>> TestPlugin::EchoNullableObject(
+    const flutter::EncodableValue* a_nullable_object) {
+  if (!a_nullable_object) {
+    return std::nullopt;
+  }
+  return *a_nullable_object;
+};
+
 void TestPlugin::NoopAsync(
     std::function<void(std::optional<FlutterError> reply)> result) {
   result(std::nullopt);

packages/pigeon/platform_tests/test_plugin/windows/test_plugin.h

@@ -47,6 +47,8 @@ class TestPlugin : public flutter::Plugin,
       const std::string& a_string) override;
   core_tests_pigeontest::ErrorOr<std::vector<uint8_t>> EchoUint8List(
       const std::vector<uint8_t>& a_uint8_list) override;
+  core_tests_pigeontest::ErrorOr<flutter::EncodableValue> EchoObject(
+      const flutter::EncodableValue& an_object) override;
   core_tests_pigeontest::ErrorOr<std::optional<std::string>>
   ExtractNestedNullableString(
       const core_tests_pigeontest::AllNullableTypesWrapper& wrapper) override;
@@ -67,7 +69,8 @@ class TestPlugin : public flutter::Plugin,
   core_tests_pigeontest::ErrorOr<std::optional<std::vector<uint8_t>>>
   EchoNullableUint8List(
       const std::vector<uint8_t>* a_nullable_uint8_list) override;
-
+  core_tests_pigeontest::ErrorOr<std::optional<flutter::EncodableValue>>
+  EchoNullableObject(const flutter::EncodableValue* a_nullable_object) override;
   void NoopAsync(std::function<
                  void(std::optional<core_tests_pigeontest::FlutterError> reply)>
                      result) override;