Add latency measurement system

cc/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_RENDERER_H_
 #define CC_RENDERER_H_
 
 #include "base/basictypes.h"
 #include "cc/cc_export.h"
 #include "cc/layer_tree_host.h"
 #include "cc/managed_memory_policy.h"
 #include "cc/render_pass.h"
 
 namespace cc {
 
 class CompositorFrameAck;
 class ScopedResource;
 
 class CC_EXPORT RendererClient {
 public:
     virtual const gfx::Size& deviceViewportSize() const = 0;
     virtual const LayerTreeSettings& settings() const = 0;
     virtual void didLoseOutputSurface() = 0;
     virtual void onSwapBuffersComplete() = 0;
     virtual void setFullRootLayerDamage() = 0;
     virtual void setManagedMemoryPolicy(const ManagedMemoryPolicy& policy) = 0;
     virtual void enforceManagedMemoryPolicy(const ManagedMemoryPolicy& policy) = 0;
     virtual bool hasImplThread() const = 0;
+    virtual void onReceivedLatencyInfo(const WebKit::WebLatencyInfoImpl&) = 0;
 protected:
     virtual ~RendererClient() { }
 };
 
 class CC_EXPORT Renderer {
 public:
     // This enum defines the various resource pools for the ResourceProvider
     // where textures get allocated.
     enum ResourcePool {
       ImplPool = 1, // This pool is for textures that get allocated on the impl thread (e.g. RenderSurfaces).
@@ skipping 26 matching lines @@
     virtual void doNoOp() { }
     // puts backbuffer onscreen
     virtual bool swapBuffers() = 0;
 
     virtual void getFramebufferPixels(void *pixels, const gfx::Rect&) = 0;
 
     virtual bool isContextLost();
 
     virtual void setVisible(bool) = 0;
 
+    virtual void setLatencyInfo(const WebKit::WebLatencyInfoImpl&) = 0;
+
     virtual void sendManagedMemoryStats(size_t bytesVisible, size_t bytesVisibleAndNearby, size_t bytesAllocated) = 0;
 
 protected:
     explicit Renderer(RendererClient* client)
         : m_client(client)
     {
     }
 
     RendererClient* m_client;
 
     DISALLOW_COPY_AND_ASSIGN(Renderer);
 };
 
 }
 
 #endif  // CC_RENDERER_H_