Add latency measurement system

content/common/gpu/texture_image_transport_surface.h

Index: content/common/gpu/texture_image_transport_surface.h
diff --git a/content/common/gpu/texture_image_transport_surface.h b/content/common/gpu/texture_image_transport_surface.h
index 45013472ef53056d96c28d5aacb22d39950619b4..c262147e4b5125d10d03cbfcf9a1da38b50ab088 100644
--- a/content/common/gpu/texture_image_transport_surface.h
+++ b/content/common/gpu/texture_image_transport_surface.h
@@ -52,6 +52,8 @@ class TextureImageTransportSurface :
       uint32 sync_point) OVERRIDE;
   virtual void OnResizeViewACK() OVERRIDE;
   virtual void OnResize(gfx::Size size) OVERRIDE;
+  virtual void SetLatencyInfo(
+      const WebKit::WebLatencyInfoImpl& latency_info) OVERRIDE;
 
   // GpuCommandBufferStub::DestructionObserver implementation.
   virtual void OnWillDestroyStub(GpuCommandBufferStub* stub) OVERRIDE;
@@ -124,6 +126,7 @@ class TextureImageTransportSurface :
   // Holds a reference to the mailbox manager for cleanup.
   scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager_;
 
+  WebKit::WebLatencyInfoImpl latency_info_;
   DISALLOW_COPY_AND_ASSIGN(TextureImageTransportSurface);
 };