cc: Introduce BeginFrame sequence numbers and acknowledgements.

services/ui/surfaces/gpu_compositor_frame_sink.h

 // Copyright 2015 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_GPU_COMPOSITOR_FRAME_SINK_H_
 #define SERVICES_UI_SURFACES_GPU_COMPOSITOR_FRAME_SINK_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 33 matching lines @@
   void SetNeedsBeginFrame(bool needs_begin_frame) override;
   void SubmitCompositorFrame(const cc::LocalFrameId& local_frame_id,
                              cc::CompositorFrame frame) override;
   void AddSurfaceReferences(
       const std::vector<cc::SurfaceReference>& references) override;
   void RemoveSurfaceReferences(
       const std::vector<cc::SurfaceReference>& references) override;
   void Require(const cc::LocalFrameId& local_frame_id,
                const cc::SurfaceSequence& sequence) override;
   void Satisfy(const cc::SurfaceSequence& sequence) override;
+  void BeginFrameDidNotDraw(const cc::BeginFrameAck& ack) override;
 
   // cc::mojom::MojoCompositorFrameSinkPrivate:
   void AddChildFrameSink(const cc::FrameSinkId& child_frame_sink_id) override;
   void RemoveChildFrameSink(
       const cc::FrameSinkId& child_frame_sink_id) override;
 
  private:
   // cc::CompositorFrameSinkSupportClient implementation:
   void DidReceiveCompositorFrameAck() override;
   void OnBeginFrame(const cc::BeginFrameArgs& args) override;
@@ skipping 13 matching lines @@
   cc::mojom::MojoCompositorFrameSinkClientPtr client_;
   mojo::Binding<cc::mojom::MojoCompositorFrameSink> binding_;
   mojo::Binding<cc::mojom::MojoCompositorFrameSinkPrivate> private_binding_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuCompositorFrameSink);
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_SURFACES_GPU_COMPOSITOR_FRAME_SINK_H_