fix scaleImageUsingDomCanvas

Author: jason-simmons

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

@@ -134,6 +134,7 @@ class CkResizingCodec extends ResizingCodec {
       return image;
     }
 
+    image.dispose();
     return CkImage(skImage, imageSource: ImageBitmapImageSource(bitmap));
   }
 }

lib/web_ui/lib/src/engine/image_decoder.dart

@@ -379,16 +379,15 @@ class ResizingCodec implements ui.Codec {
   @override
   Future<ui.FrameInfo> getNextFrame() async {
     final ui.FrameInfo frameInfo = await delegate.getNextFrame();
-    final ui.Image scaledImage = scaleImage(
+    return AnimatedImageFrameInfo(
+      frameInfo.duration,
+      scaleImage(
         frameInfo.image,
         targetWidth: targetWidth,
         targetHeight: targetHeight,
         allowUpscaling: allowUpscaling,
+      ),
     );
-    if (!identical(frameInfo.image, scaledImage)) {
-      frameInfo.image.dispose();
-    }
-    return AnimatedImageFrameInfo(frameInfo.duration, scaledImage);
   }
 
   ui.Image scaleImage(