WIP: Surface Synchronization System

ui/aura/mus/client_surface_embedder.h

Index: ui/aura/mus/client_surface_embedder.h
diff --git a/ui/aura/mus/client_surface_embedder.h b/ui/aura/mus/client_surface_embedder.h
index 75b45c224fe909eabb246947cb4836fb0187b631..74bf62bf6e4a1671f240f346c393ce053d44e700 100644
--- a/ui/aura/mus/client_surface_embedder.h
+++ b/ui/aura/mus/client_surface_embedder.h
@@ -29,6 +29,8 @@ class ClientSurfaceEmbedder {
   // Updates the surface layer and the clip layer based on the surface info.
   void UpdateSurface(const cc::SurfaceInfo& surface_info);
 
+  void SetFallbackSurfaceInfo(const cc::SurfaceInfo& surface_info);
+
  private:
   // The window which embeds the client.
   Window* window_;