Mus+Ash: propagate Surface ID to parents

services/ui/ws/window_tree.h

Index: services/ui/ws/window_tree.h
diff --git a/services/ui/ws/window_tree.h b/services/ui/ws/window_tree.h
index 4268d0efaf6914712e010e93ce589f5572da91fd..0fc94769784a3a0ffc98983a273fd6d3f109e725 100644
--- a/services/ui/ws/window_tree.h
+++ b/services/ui/ws/window_tree.h
@@ -256,6 +256,10 @@ class WindowTree : public mojom::WindowTree,
   void ProcessTransientWindowRemoved(const ServerWindow* window,
                                      const ServerWindow* transient_window,
                                      bool originated_change);
+  void ProcessWindowSurfaceChanged(ServerWindow* window,
+                                   const cc::SurfaceId& surface_id,
+                                   const gfx::Size& frame_size,
+                                   float device_scale_factor);
 
   // Sends this event to the client if it matches an active pointer watcher.
   // |target_window| is the target of the event, and may be null or not known
@@ -413,6 +417,8 @@ class WindowTree : public mojom::WindowTree,
                      mojom::SurfaceType type,
                      mojo::InterfaceRequest<mojom::Surface> surface,
                      mojom::SurfaceClientPtr client) override;
+  void OnWindowSurfaceDetached(Id transport_window_id,
+                               const cc::SurfaceSequence& sequence) override;
   void Embed(Id transport_window_id,
              mojom::WindowTreeClientPtr client,
              uint32_t flags,