Add latency measurement system

content/common/gpu/image_transport_surface_win.cc

Index: content/common/gpu/image_transport_surface_win.cc
diff --git a/content/common/gpu/image_transport_surface_win.cc b/content/common/gpu/image_transport_surface_win.cc
index 7dc21c620869084217a538a4ddf1d024a71ae522..f8391ae70709cbcc200e0b1592c0c4c9b1ab83f3 100644
--- a/content/common/gpu/image_transport_surface_win.cc
+++ b/content/common/gpu/image_transport_surface_win.cc
@@ -54,6 +54,7 @@ class PbufferImageTransportSurface
       const AcceleratedSurfaceMsg_BufferPresented_Params& params) OVERRIDE;
   virtual void OnResizeViewACK() OVERRIDE;
   virtual void OnResize(gfx::Size size) OVERRIDE;
+  virtual void SetLatencyInfo(const cc::LatencyInfo&) OVERRIDE;
   virtual gfx::Size GetSize() OVERRIDE;
 
  private:
@@ -230,6 +231,11 @@ void PbufferImageTransportSurface::OnResize(gfx::Size size) {
   visible_size_ = size;
 }
 
+void PbufferImageTransportSurface::SetLatencyInfo(
+    const cc::LatencyInfo&) {
+  // TODO: implement
+}
+
 gfx::Size PbufferImageTransportSurface::GetSize() {
   return GLSurfaceAdapter::GetSize();
 }