[cc] CompositorFrameSinkSupport: Defer BeginFrameAck of pending frames.

cc/surfaces/surface_factory.cc

Index: cc/surfaces/surface_factory.cc
diff --git a/cc/surfaces/surface_factory.cc b/cc/surfaces/surface_factory.cc
index 880cb8c828a675fe85cd426bfb9caa05355e6cbc..0924899559cd497b1263bc3e2152dee5670296ac 100644
--- a/cc/surfaces/surface_factory.cc
+++ b/cc/surfaces/surface_factory.cc
@@ -116,6 +116,9 @@ void SurfaceFactory::OnReferencedSurfacesChanged(
 
 void SurfaceFactory::OnSurfaceActivated(Surface* surface) {
   DCHECK(surface->HasActiveFrame());
+
+  client_->PendingFrameActivated(surface->surface_id().local_surface_id());
+
   if (seen_first_frame_activation_)
     return;
 
@@ -138,7 +141,9 @@ void SurfaceFactory::OnSurfaceDependenciesChanged(
     const SurfaceDependencies& added_dependencies,
     const SurfaceDependencies& removed_dependencies) {}
 
-void SurfaceFactory::OnSurfaceDiscarded(Surface* surface) {}
+void SurfaceFactory::OnSurfaceDiscarded(Surface* surface) {
+  client_->SurfaceDiscarded(surface->surface_id().local_surface_id());
+}
 
 std::unique_ptr<Surface> SurfaceFactory::Create(
     const LocalSurfaceId& local_surface_id) {
@@ -150,8 +155,10 @@ std::unique_ptr<Surface> SurfaceFactory::Create(
 }
 
 void SurfaceFactory::Destroy(std::unique_ptr<Surface> surface) {
+  LocalSurfaceId surface_id = surface->surface_id().local_surface_id();
   surface->RemoveObserver(this);
   manager_->DestroySurface(std::move(surface));
+  client_->SurfaceDiscarded(surface_id);
 }
 
 }  // namespace cc