Make cc::Display not own its BeginFrameSource

services/ui/surfaces/display_compositor.h

 // Copyright 2016 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_SURFACES_DISPLAY_COMPOSITOR_H_
 #define SERVICES_UI_SURFACES_DISPLAY_COMPOSITOR_H_
 
+#include "cc/scheduler/begin_frame_source.h"
 #include "cc/surfaces/display_client.h"
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_factory.h"
 #include "cc/surfaces/surface_factory_client.h"
 #include "cc/surfaces/surface_id_allocator.h"
 #include "services/ui/surfaces/surfaces_state.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace cc {
 class Display;
@@ skipping 52 matching lines @@
   void DisplayDidDrawAndSwap() override;
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   scoped_refptr<SurfacesState> surfaces_state_;
   cc::SurfaceFactory factory_;
   cc::SurfaceIdAllocator allocator_;
   cc::SurfaceId surface_id_;
 
   gfx::Size display_size_;
   std::unique_ptr<cc::Display> display_;
+  std::unique_ptr<cc::SyntheticBeginFrameSource> synthetic_begin_frame_source_;
   DISALLOW_COPY_AND_ASSIGN(DisplayCompositor);
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_SURFACES_DISPLAY_COMPOSITOR_H_