Plumb PinchVirtualViewport layers into CC.

content/renderer/gpu/render_widget_compositor.h

 // Copyright (c) 2013 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 CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_H_
 #define CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "cc/debug/rendering_stats.h"
@@ skipping 69 matching lines @@
                                        float new_page_scale,
                                        double duration_sec);
   virtual void setNeedsAnimate();
   virtual void setNeedsRedraw();
   virtual bool commitRequested() const;
   virtual void didStopFlinging();
   virtual bool compositeAndReadback(void *pixels, const WebKit::WebRect& rect);
   virtual void finishAllRendering();
   virtual void setDeferCommits(bool defer_commits);
   virtual void registerForAnimations(WebKit::WebLayer* layer);
+  virtual void registerViewportLayers(
+      const WebKit::WebLayer* pageScaleLayer,
+      const WebKit::WebLayer* innerViewportScrollLayer,
+      const WebKit::WebLayer* outerViewportScrollLayer) OVERRIDE;
+  virtual void clearViewportLayers() OVERRIDE;
   virtual void renderingStats(WebKit::WebRenderingStats& stats) const {}
   virtual void setShowFPSCounter(bool show);
   virtual void setShowPaintRects(bool show);
   virtual void setShowDebugBorders(bool show);
   virtual void setContinuousPaintingEnabled(bool enabled);
   virtual void setShowScrollBottleneckRects(bool show);
 
   // cc::LayerTreeHostClient implementation.
   virtual void WillBeginFrame() OVERRIDE;
   virtual void DidBeginFrame() OVERRIDE;
@@ skipping 21 matching lines @@
 
   bool threaded_;
   bool suppress_schedule_composite_;
   RenderWidget* widget_;
   scoped_ptr<cc::LayerTreeHost> layer_tree_host_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_H_