cc: Hook vsync time source to output surface

cc/test/fake_output_surface.cc

Index: cc/test/fake_output_surface.cc
diff --git a/cc/test/fake_output_surface.cc b/cc/test/fake_output_surface.cc
index 0b9a6d3dd98d3fd65febf22d8343cfaf078bed9d..a5f70798cb84c5d2b13760a07d837d4e9ee067d7 100644
--- a/cc/test/fake_output_surface.cc
+++ b/cc/test/fake_output_surface.cc
@@ -4,12 +4,16 @@
 
 #include "cc/test/fake_output_surface.h"
 
+#include "base/time.h"
+#include "cc/output/output_surface_client.h"
+
 namespace cc {
 
 FakeOutputSurface::FakeOutputSurface(
     scoped_ptr<WebKit::WebGraphicsContext3D> context3d, bool has_parent)
     : OutputSurface(context3d.Pass()),
-      num_sent_frames_(0) {
+      num_sent_frames_(0),
+      vsync_notification_enabled_(false) {
   capabilities_.has_parent_compositor = has_parent;
 }
 
@@ -37,4 +41,12 @@ void FakeOutputSurface::SendFrameToParentCompositor(
   ++num_sent_frames_;
 }
 
+void FakeOutputSurface::EnableVSyncNotification(bool enable) {
+  vsync_notification_enabled_ = enable;
+}
+
+void FakeOutputSurface::DidVSync(base::TimeTicks frame_time) {
+  client_->DidVSync(frame_time);
+}
+
 }  // namespace cc