Fixing repeated pixels when drawing HTML5 video to canvas.

media/renderers/skcanvas_video_renderer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/renderers/skcanvas_video_renderer.h"
 
 #include <limits>
 
 #include "base/macros.h"
 #include "gpu/GLES2/gl2extchromium.h"
@@ skipping 769 matching lines @@
         last_image_ =
             NewSkImageFromVideoFrameYUVTextures(video_frame.get(), context_3d);
       } else {
         last_image_ =
             NewSkImageFromVideoFrameNative(video_frame.get(), context_3d);
       }
     } else {
       auto* video_generator = new VideoImageGenerator(video_frame);
       last_image_ = SkImage::MakeFromGenerator(video_generator);
     }
+    CorrectLastImageDimensions(gfx::RectToSkIRect(video_frame->visible_rect()));
     if (!last_image_)  // Couldn't create the SkImage.
       return false;
     last_timestamp_ = video_frame->timestamp();
   }
   last_image_deleting_timer_.Reset();
   DCHECK(!!last_image_);
   return true;
 }
 
+void SkCanvasVideoRenderer::CorrectLastImageDimensions(
+    const SkIRect& visible_rect) {
+  last_image_dimensions_for_testing_ = visible_rect.size();
+  if (!last_image_)
+    return;
+  if (last_image_->dimensions() != visible_rect.size() &&
+      last_image_->bounds().contains(visible_rect)) {
+    last_image_ = last_image_->makeSubset(visible_rect);
+  }
+}
+
+SkISize SkCanvasVideoRenderer::LastImageDimensionsForTesting() {
+  return last_image_dimensions_for_testing_;
+}
+
 }  // namespace media