cc: Set up the framework to restrict access to Layer internals.

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 {
 
@@ skipping 17 matching lines @@
 }
 
 bool VideoLayer::Update() {
   bool updated = Layer::Update();
 
   // 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.
-  updated |= !update_rect_.IsEmpty();
+  updated |= !update_rect().IsEmpty();
 
   return updated;
 }
 
 void VideoLayer::StopUsingProvider() {
   provider_ = nullptr;
 }
 
 }  // namespace cc