WIP: Surface Synchronization System

ui/aura/mus/client_surface_embedder.cc

Index: ui/aura/mus/client_surface_embedder.cc
diff --git a/ui/aura/mus/client_surface_embedder.cc b/ui/aura/mus/client_surface_embedder.cc
index 9bd41062c5ccede7311d81f1f7de7fd9fe0054cc..9fda5532004558399997007b4b1cb2ec433f3dc4 100644
--- a/ui/aura/mus/client_surface_embedder.cc
+++ b/ui/aura/mus/client_surface_embedder.cc
@@ -71,4 +71,10 @@ void ClientSurfaceEmbedder::UpdateSurface(const cc::SurfaceInfo& surface_info) {
       surface_info, make_scoped_refptr(new StubSurfaceReferenceFactory));
 }
 
+void ClientSurfaceEmbedder::SetFallbackSurfaceInfo(
+    const cc::SurfaceInfo& surface_info) {
+  surface_layer_->SetFallbackSurface(
+      surface_info, make_scoped_refptr(new StubSurfaceReferenceFactory));
+}
+
 }  // namespace aura