Add latency measurement system

cc/delegating_renderer.h

 // Copyright 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.
 
 #ifndef CC_DELEGATING_RENDERER_H_
 #define CC_DELEGATING_RENDERER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/cc_export.h"
 #include "cc/renderer.h"
@@ skipping 28 matching lines @@
   virtual void receiveCompositorFrameAck(const CompositorFrameAck&) OVERRIDE;
 
   virtual bool isContextLost() OVERRIDE;
 
   virtual void setVisible(bool) OVERRIDE;
 
   virtual void sendManagedMemoryStats(size_t bytes_visible,
                                       size_t bytes_visible_and_nearby,
                                       size_t bytes_allocated) OVERRIDE {}
 
+  virtual void setLatencyInfo(const WebKit::WebLatencyInfoImpl&) OVERRIDE {}
+
   // WebGraphicsContext3D::WebGraphicsContextLostCallback implementation.
   virtual void onContextLost() OVERRIDE;
 
 private:
   DelegatingRenderer(RendererClient* client,
                      ResourceProvider* resource_provider);
   bool Initialize();
 
   ResourceProvider* resource_provider_;
   RendererCapabilities capabilities_;
   bool visible_;
 
   DISALLOW_COPY_AND_ASSIGN(DelegatingRenderer);
 };
 
 }  // namespace cc
 
 #endif  // CC_DELEGATING_RENDERER_H_