cc: Introduce mechanism to observe CompositorFrames submitted to new surfaceIDs

cc/surfaces/surface_manager.cc

Index: cc/surfaces/surface_manager.cc
diff --git a/cc/surfaces/surface_manager.cc b/cc/surfaces/surface_manager.cc
index 027b8ff5f8b0aeff0279cc4e5e6f808e4ab10d24..c627b033a8adc4efa3fe13385983dde549131cd4 100644
--- a/cc/surfaces/surface_manager.cc
+++ b/cc/surfaces/surface_manager.cc
@@ -345,9 +345,18 @@ Surface* SurfaceManager::GetSurfaceForId(const SurfaceId& surface_id) {
 bool SurfaceManager::SurfaceModified(const SurfaceId& surface_id) {
   CHECK(thread_checker_.CalledOnValidThread());
   bool changed = false;
-  FOR_EACH_OBSERVER(SurfaceDamageObserver, observer_list_,
+  FOR_EACH_OBSERVER(SurfaceObserver, observer_list_,
                     OnSurfaceDamaged(surface_id, &changed));
   return changed;
 }
 
+void SurfaceManager::SurfaceCreated(const SurfaceId& surface_id,
+                                    const gfx::Size& frame_size,
+                                    float device_scale_factor) {
+  CHECK(thread_checker_.CalledOnValidThread());
+  FOR_EACH_OBSERVER(
+      SurfaceObserver, observer_list_,
+      OnSurfaceCreated(surface_id, frame_size, device_scale_factor));
+}
+
 }  // namespace cc