Mus+Ash: propagate Surface ID to parents

services/ui/public/cpp/window_observer.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SERVICES_UI_PUBLIC_CPP_WINDOW_OBSERVER_H_
 #define SERVICES_UI_PUBLIC_CPP_WINDOW_OBSERVER_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 100 matching lines @@
   // Sent when the drawn state changes. This is only sent for the root nodes
   // when embedded.
   virtual void OnWindowDrawnChanging(Window* window) {}
   virtual void OnWindowDrawnChanged(Window* window) {}
 
   virtual void OnTransientChildAdded(ui::Window* window,
                                      ui::Window* transient) {}
   virtual void OnTransientChildRemoved(ui::Window* window,
                                        ui::Window* transient) {}
 
+  virtual void OnChildWindowSurfaceCreated(
+      Window* window,
+      const cc::SurfaceId& surface_id,
+      const cc::SurfaceSequence& surface_sequence,
+      const gfx::Size& frame_size,
+      float device_scale_factor) {}
+
   // The WindowManager has requested the window to close. If the observer
   // allows the close it should destroy the window as appropriate.
   virtual void OnRequestClose(Window* window) {}
 
  protected:
   virtual ~WindowObserver() {}
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_PUBLIC_CPP_WINDOW_OBSERVER_H_