Unify background color gutters.

chrome/browser/android/compositor/layer/content_layer.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_ANDROID_COMPOSITOR_LAYER_CONTENT_LAYER_H_
 #define CHROME_BROWSER_ANDROID_COMPOSITOR_LAYER_CONTENT_LAYER_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "chrome/browser/android/compositor/layer/layer.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace cc {
 class Layer;
 }
 
 namespace android {
 
 class TabContentManager;
-class ThumbnailLayer;
 
 // Sub layer tree representation of the contents of a tab.
 // Contains logic to temporarily display a static thumbnail
 // when the content layer is not available.
 // To specialize call SetProperties.
 class ContentLayer : public Layer {
  public:
   static scoped_refptr<ContentLayer> Create(
       TabContentManager* tab_content_manager);
   void SetProperties(int id,
                      bool can_use_live_layer,
                      float static_to_view_blend,
                      bool should_override_content_alpha,
                      float content_alpha_override,
                      float saturation,
                      bool should_clip,
                      const gfx::Rect& clip);
 
   scoped_refptr<cc::Layer> layer() override;
 
+  gfx::Size ComputeSize(int id) const;
+
  protected:
   explicit ContentLayer(TabContentManager* tab_content_manager);
   ~ContentLayer() override;
 
  private:
-  void SetContentLayer(scoped_refptr<cc::Layer> layer);
-  void SetStaticLayer(scoped_refptr<ThumbnailLayer> layer);
-
   // This is an intermediate shim layer whose children are
   // both the static and content layers (or either, or none, depending on which
   // is available).
   scoped_refptr<cc::Layer> layer_;
 
   TabContentManager* tab_content_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentLayer);
 };
 
 }  //  namespace android
 
 #endif  // CHROME_BROWSER_ANDROID_COMPOSITOR_LAYER_CONTENT_LAYER_H_