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 17a2be6dc0e347c35db38abec4399d871f5b472f..b0e3cd4c7c6793d6d597f1aa4e4794b7f00e5b27 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 GpuHostMsg_AcceleratedSurfaceNew_Params;
 struct GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params;
@@ -63,6 +64,8 @@ class ImageTransportSurface {
   virtual void OnBufferPresented(uint64 surface_handle, uint32 sync_point) = 0;
   virtual void OnResizeViewACK() = 0;
   virtual void OnResize(gfx::Size size) = 0;
+  virtual void SetLatencyInfo(
+      const WebKit::WebLatencyInfoImpl& latency_info) = 0;
 
   // Creates the appropriate surface depending on the GL implementation.
   static scoped_refptr<gfx::GLSurface>
@@ -117,6 +120,8 @@ class ImageTransportHelper
   void SendUpdateVSyncParameters(
       base::TimeTicks timebase, base::TimeDelta interval);
 
+  void SendLatencyInfo(const WebKit::WebLatencyInfoImpl& latency_info);
+
   // Whether or not we should execute more commands.
   void SetScheduled(bool is_scheduled);
 
@@ -143,10 +148,13 @@ class ImageTransportHelper
   // IPC::Message handlers.
   void OnBufferPresented(uint64 surface_handle, uint32 sync_point);
   void OnResizeViewACK();
+  void OnFrameDisplayed(const WebKit::WebLatencyInfoImpl& latency_info);
 
   // Backbuffer resize callback.
   void Resize(gfx::Size size);
 
+  void SetLatencyInfo(const WebKit::WebLatencyInfoImpl& 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 WebKit::WebLatencyInfoImpl& latency_info) OVERRIDE;
 
  protected:
   virtual ~PassThroughImageTransportSurface();
@@ -195,6 +205,7 @@ class PassThroughImageTransportSurface
   gfx::Size new_size_;
   bool transport_;
   bool did_set_swap_interval_;
+  WebKit::WebLatencyInfoImpl latency_info_;
 
   DISALLOW_COPY_AND_ASSIGN(PassThroughImageTransportSurface);
 };