Add SurfaceWillDraw notification

cc/test/fake_surface_observer.h

Index: cc/test/fake_surface_observer.h
diff --git a/cc/test/fake_surface_observer.h b/cc/test/fake_surface_observer.h
index ab0bab5d09202280189b19c3c82c11dc11d9bdcf..82c2bae238e5da1b0ea91d634a0a81b68c7cc4ad 100644
--- a/cc/test/fake_surface_observer.h
+++ b/cc/test/fake_surface_observer.h
@@ -41,6 +41,7 @@ class FakeSurfaceObserver : public SurfaceObserver {
   void OnSurfaceDestroyed(const SurfaceId& surface_id) override {}
   void OnSurfaceDamageExpected(const SurfaceId& surface_id,
                                const BeginFrameArgs& args) override {}
+  void OnSurfaceWillDraw(const SurfaceId& surface_id) override {}
 
   bool damage_display_;
   BeginFrameAck last_ack_;