Add latency measurement system

content/common/gpu/image_transport_surface.h

Index: content/common/gpu/image_transport_surface.h
diff --git a/content/common/gpu/image_transport_surface.h b/content/common/gpu/image_transport_surface.h
index 926a35d4d91db3d483cd087680492e17e34a19b3..dca9c6039f771eb3126eea949dd1f856e08a6787 100644
--- a/content/common/gpu/image_transport_surface.h
+++ b/content/common/gpu/image_transport_surface.h
@@ -21,6 +21,7 @@
 #include "ui/gfx/size.h"
 #include "ui/gl/gl_surface.h"
 #include "ui/surface/transport_dib.h"
+#include "webkit/compositor_bindings/web_latency_info_impl.h"
 
 struct AcceleratedSurfaceMsg_BufferPresented_Params;
 struct GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params;
@@ -64,6 +65,8 @@ class ImageTransportSurface {
       const AcceleratedSurfaceMsg_BufferPresented_Params& params) = 0;
   virtual void OnResizeViewACK() = 0;
   virtual void OnResize(gfx::Size size) = 0;
+  virtual void SetLatencyInfo(
+      const cc::LatencyInfo& latency_info) = 0;
 
   // Creates the appropriate surface depending on the GL implementation.
   static scoped_refptr<gfx::GLSurface>
@@ -116,6 +119,8 @@ class ImageTransportHelper
   void SendUpdateVSyncParameters(
       base::TimeTicks timebase, base::TimeDelta interval);
 
+  void SendLatencyInfo(const cc::LatencyInfo& latency_info);
+
   // Whether or not we should execute more commands.
   void SetScheduled(bool is_scheduled);
 
@@ -143,10 +148,13 @@ class ImageTransportHelper
   void OnBufferPresented(
       const AcceleratedSurfaceMsg_BufferPresented_Params& params);
   void OnResizeViewACK();
+  void OnFrameDisplayed(const cc::LatencyInfo& latency_info);
 
   // Backbuffer resize callback.
   void Resize(gfx::Size size);
 
+  void SetLatencyInfo(const cc::LatencyInfo& latency_info);
+
   // Weak pointers that point to objects that outlive this helper.
   ImageTransportSurface* surface_;
   GpuChannelManager* manager_;
@@ -182,6 +190,8 @@ class PassThroughImageTransportSurface
   virtual void OnResizeViewACK() OVERRIDE;
   virtual void OnResize(gfx::Size size) OVERRIDE;
   virtual gfx::Size GetSize() OVERRIDE;
+  virtual void SetLatencyInfo(
+      const cc::LatencyInfo& latency_info) OVERRIDE;
 
  protected:
   virtual ~PassThroughImageTransportSurface();
@@ -195,6 +205,7 @@ class PassThroughImageTransportSurface
   gfx::Size new_size_;
   bool transport_;
   bool did_set_swap_interval_;
+  cc::LatencyInfo latency_info_;
 
   DISALLOW_COPY_AND_ASSIGN(PassThroughImageTransportSurface);
 };