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 62296a7a571de66422e9ddfa0e3c8068378655e6..8500af53315206fd0763fa74debd5b824ae1cbff 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
                                  uint32 sync_point) OVERRIDE;
   virtual void OnResizeViewACK() OVERRIDE;
   virtual void OnResize(gfx::Size size) OVERRIDE;
+  virtual void SetLatencyInfo(const WebKit::WebLatencyInfoImpl&) OVERRIDE;
   virtual gfx::Size GetSize() OVERRIDE;
 
  private:
@@ -230,6 +231,11 @@ void PbufferImageTransportSurface::OnResize(gfx::Size size) {
   visible_size_ = size;
 }
 
+void PbufferImageTransportSurface::SetLatencyInfo(
+    const WebKit::WebLatencyInfoImpl&) {
+  // TODO: implement
+}
+
 gfx::Size PbufferImageTransportSurface::GetSize() {
   return GLSurfaceAdapter::GetSize();
 }