Add latency measurement system

content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h

Index: content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h
diff --git a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h b/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h
index b88a8cdebca185fc7b95d8cdc8685e8238acdbf5..1ed9b871a9e50936faaea4432781c8338b0a211b 100644
--- a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h
+++ b/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h
@@ -629,6 +629,10 @@ class WebGraphicsContext3DCommandBufferImpl
       WGC3Denum type,
       const void* pixels);
 
+  virtual void setLatencyInfoCHROMIUM(
+      const WebKit::WebLatencyInfo& latencyInfo);
+  virtual void setLatencyInfoCallbackCHROMIUM(
+      WebGraphicsLatencyInfoCallbackCHROMIUM* callback);
  protected:
   virtual GrGLInterface* onCreateGrGLInterface();
 
@@ -704,6 +708,8 @@ class WebGraphicsContext3DCommandBufferImpl
       WebGraphicsMemoryAllocationChangedCallbackCHROMIUM* callback,
       const GpuMemoryAllocationForRenderer& allocation);
 
+  void OnSetLatencyInfo(const WebKit::WebLatencyInfoImpl& latency_info);
+
   // Convert the gpu cutoff enum to the WebKit enum.
   static WebGraphicsMemoryAllocation::PriorityCutoff WebkitPriorityCutoff(
       GpuMemoryAllocationForRenderer::PriorityCutoff priorityCutoff);
@@ -733,6 +739,9 @@ class WebGraphicsContext3DCommandBufferImpl
   WebGraphicsContext3D::WebGraphicsSwapBuffersCompleteCallbackCHROMIUM*
       swapbuffers_complete_callback_;
 
+  WebGraphicsContext3D::WebGraphicsLatencyInfoCallbackCHROMIUM*
+      latency_info_callback_;
+
   WebKit::WebGraphicsContext3D::Attributes attributes_;
   gfx::GpuPreference gpu_preference_;
   int cached_width_, cached_height_;