mus: Embedder can request and observe BeginFrame for embedded client.

ui/aura/mus/window_port_mus.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 UI_AURA_MUS_WINDOW_PORT_MUS_H_
 #define UI_AURA_MUS_WINDOW_PORT_MUS_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 75 matching lines @@
   void RequestCompositorFrameSinkInternal(
       scoped_refptr<cc::ContextProvider> context_provider,
       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
       const CompositorFrameSinkCallback& callback);
 
   void AttachCompositorFrameSink(
       std::unique_ptr<ui::ClientCompositorFrameSinkBinding>
           compositor_frame_sink_binding);
 
  private:
+  class FrameSinkObserver;
+
   friend class WindowPortMusTestApi;
   friend class WindowTreeClient;
   friend class WindowTreeClientPrivate;
   friend class WindowTreeHostMus;
 
   using ServerChangeIdType = uint8_t;
 
   // Changes to the underlying Window originating from the server must be done
   // in such a way that the same change is not applied back to the server. To
   // accomplish this every changes from the server is associated with at least
@@ skipping 151 matching lines @@
   void OnVisibilityChanged(bool visible) override;
   void OnDidChangeBounds(const gfx::Rect& old_bounds,
                          const gfx::Rect& new_bounds) override;
   std::unique_ptr<ui::PropertyData> OnWillChangeProperty(
       const void* key) override;
   void OnPropertyChanged(const void* key,
                          int64_t old_value,
                          std::unique_ptr<ui::PropertyData> data) override;
   std::unique_ptr<cc::CompositorFrameSink> CreateCompositorFrameSink() override;
   cc::SurfaceId GetSurfaceId() const override;
+  void SetNeedsBeginFrames(bool needs,
+                           base::RepeatingClosure callback) override;
   void OnWindowAddedToRootWindow() override {}
   void OnWillRemoveWindowFromRootWindow() override {}
 
   void UpdatePrimarySurfaceInfo();
   void UpdateClientSurfaceEmbedder();
 
   WindowTreeClient* window_tree_client_;
 
   Window* window_ = nullptr;
 
   // Used when this window is embedding a client.
   std::unique_ptr<ClientSurfaceEmbedder> client_surface_embedder_;
 
   ServerChangeIdType next_server_change_id_ = 0;
   ServerChanges server_changes_;
 
   cc::FrameSinkId frame_sink_id_;
   base::Closure pending_compositor_frame_sink_request_;
 
   cc::SurfaceInfo primary_surface_info_;
   cc::SurfaceInfo fallback_surface_info_;
 
   cc::LocalSurfaceId local_surface_id_;
   cc::LocalSurfaceIdAllocator local_surface_id_allocator_;
   gfx::Size last_surface_size_;
 
   ui::CursorData cursor_;
 
+  std::unique_ptr<FrameSinkObserver> frame_sink_observer_;
+
   DISALLOW_COPY_AND_ASSIGN(WindowPortMus);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_MUS_WINDOW_PORT_MUS_H_