cc: Introduce BeginFrame sequence numbers and acknowledgements.

ui/aura/mus/window_compositor_frame_sink.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 UI_AURA_MUS_WINDOW_COMPOSITOR_FRAME_SINK_H_
 #define UI_AURA_MUS_WINDOW_COMPOSITOR_FRAME_SINK_H_
 
 #include "base/macros.h"
 #include "cc/ipc/mojo_compositor_frame_sink.mojom.h"
 #include "cc/output/compositor_frame_sink.h"
@@ skipping 33 matching lines @@
       cc::mojom::MojoCompositorFrameSinkClientRequest client_request);
 
   // cc::mojom::MojoCompositorFrameSinkClient implementation:
   void DidReceiveCompositorFrameAck() override;
   void OnBeginFrame(const cc::BeginFrameArgs& begin_frame_args) override;
   void ReclaimResources(const cc::ReturnedResourceArray& resources) override;
   void WillDrawSurface() override;
 
   // cc::ExternalBeginFrameSourceClient implementation.
   void OnNeedsBeginFrames(bool needs_begin_frames) override;
+  void OnDidFinishFrame(const cc::BeginFrameAck& ack) override;
 
   gfx::Size last_submitted_frame_size_;
   cc::LocalFrameId local_frame_id_;
   cc::SurfaceIdAllocator id_allocator_;
   std::unique_ptr<cc::ExternalBeginFrameSource> begin_frame_source_;
   cc::mojom::MojoCompositorFrameSinkPtrInfo compositor_frame_sink_info_;
   cc::mojom::MojoCompositorFrameSinkClientRequest client_request_;
   cc::mojom::MojoCompositorFrameSinkPtr compositor_frame_sink_;
   std::unique_ptr<mojo::Binding<cc::mojom::MojoCompositorFrameSinkClient>>
       client_binding_;
@@ skipping 24 matching lines @@
   cc::mojom::MojoCompositorFrameSinkRequest compositor_frame_sink_request_;
   mojo::InterfacePtrInfo<cc::mojom::MojoCompositorFrameSinkClient>
       compositor_frame_sink_client_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowCompositorFrameSinkBinding);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_MUS_WINDOW_COMPOSITOR_FRAME_SINK_H_