Add setImageSampler for canvaskit

lib/web_ui/lib/painting.dart

@@ -818,6 +818,8 @@ abstract class FragmentProgram {
 abstract class FragmentShader implements Shader {
   void setFloat(int index, double value);
 
+  void setImageSampler(int index, Image image);
+
   void setSampler(int index, ImageShader sampler);
 
   @override

lib/web_ui/lib/src/engine/canvaskit/painting.dart

@@ -8,6 +8,7 @@ import 'dart:typed_data';
 import 'package:ui/ui.dart' as ui;
 
 import '../color_filter.dart';
+import '../vector_math.dart';
 import 'canvaskit_api.dart';
 import 'color_filter.dart';
 import 'image_filter.dart';
@@ -476,6 +477,19 @@ class CkFragmentShader implements ui.FragmentShader {
     floats[index] = value;
   }
 
+  @override
+  void setImageSampler(int index, ui.Image image) {
+    ui.ImageShader sampler = ui.ImageShader(
+        image,
+        ui.TileMode.clamp,
+        ui.TileMode.clamp,
+        Float32List.fromList(Matrix4.identity().storage),
+        null);
+    samplers[index] = (sampler as CkShader).skiaObject;
+    setFloat(lastFloatIndex + 2 * index, (sampler as CkImageShader).imageWidth.toDouble());
+    setFloat(lastFloatIndex + 2 * index + 1, sampler.imageHeight.toDouble());
+  }
+
   @override
   void setSampler(int index, ui.ImageShader sampler) {
     samplers[index] = (sampler as CkShader).skiaObject;

lib/web_ui/lib/src/engine/html/painting.dart

@@ -302,6 +302,11 @@ class HtmlFragmentShader implements ui.FragmentShader {
     throw UnsupportedError('FragmentShader is not supported for the HTML renderer.');
   }
 
+  @override
+  void setImageSampler(int index, ui.Image image) {
+    throw UnsupportedError('FragmentShader is not supported for the HTML renderer.');
+  }
+
   @override
   void setSampler(int index, ui.ImageShader sampler) {
     throw UnsupportedError('FragmentShader is not supported for the HTML renderer.');