Fixing repeated pixels when drawing HTML5 video to canvas.

media/renderers/skcanvas_video_renderer.h

Index: media/renderers/skcanvas_video_renderer.h
diff --git a/media/renderers/skcanvas_video_renderer.h b/media/renderers/skcanvas_video_renderer.h
index 86222fb55e8abd9d72d3547f97575cc3d2bb9f10..9323a82fed4d55c8160707d809c5fb6030186d33 100644
--- a/media/renderers/skcanvas_video_renderer.h
+++ b/media/renderers/skcanvas_video_renderer.h
@@ -99,6 +99,11 @@ class MEDIA_EXPORT SkCanvasVideoRenderer {
   // never be painted again, so we can release the resource.
   void ResetCache();
 
+  void CorrectLastImageDimensions(const SkIRect& visible_rect);
+
+  // Used for unit test.
+  SkISize LastImageDimensionsForTesting();
+
  private:
   // Update the cache holding the most-recently-painted frame. Returns false
   // if the image couldn't be updated.
@@ -115,6 +120,9 @@ class MEDIA_EXPORT SkCanvasVideoRenderer {
   // Used for DCHECKs to ensure method calls executed in the correct thread.
   base::ThreadChecker thread_checker_;
 
+  // Used for unit test.
+  SkISize last_image_dimensions_for_testing_;
+
   DISALLOW_COPY_AND_ASSIGN(SkCanvasVideoRenderer);
 };