cc: Fix accelerated video freezing with commit aborts

cc/layers/video_layer.cc

 // Copyright 2010 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 "cc/layers/video_layer.h"
 
 #include "cc/layers/video_layer_impl.h"
 
 namespace cc {
 
 scoped_refptr<VideoLayer> VideoLayer::Create(VideoFrameProvider* provider) {
   return make_scoped_refptr(new VideoLayer(provider));
 }
 
 VideoLayer::VideoLayer(VideoFrameProvider* provider) : provider_(provider) {
   DCHECK(provider_);
 }
 
 VideoLayer::~VideoLayer() {}
 
 scoped_ptr<LayerImpl> VideoLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
   return VideoLayerImpl::Create(tree_impl, id(), provider_).PassAs<LayerImpl>();
 }
 
+bool VideoLayer::Update(ResourceUpdateQueue* queue,
+                        const OcclusionTracker* occlusion) {
+  // Video layer doesn't update any resources from the main thread side,
+  // but repaint rects need to be sent to the VideoLayerImpl via commit.
+  //
+  // This is the inefficient legacy redraw path for videos.  It's better to
+  // communicate this directly to the VideoLayerImpl.
+  return !update_rect_.IsEmpty();
+}
+
 }  // namespace cc