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

components/viz/frame_sinks/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 COMPONENTS_VIZ_FRAME_SINKS_GPU_COMPOSITOR_FRAME_SINK_H_
 #define COMPONENTS_VIZ_FRAME_SINKS_GPU_COMPOSITOR_FRAME_SINK_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "cc/ipc/frame_sink_manager.mojom.h"
 #include "cc/ipc/mojo_compositor_frame_sink.mojom.h"
 #include "cc/surfaces/compositor_frame_sink_support.h"
 #include "cc/surfaces/compositor_frame_sink_support_client.h"
 #include "cc/surfaces/local_surface_id.h"
 #include "cc/surfaces/surface_id.h"
 #include "components/viz/frame_sinks/gpu_compositor_frame_sink_delegate.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
 namespace viz {
 
@@ skipping 17 matching lines @@
   void EvictCurrentSurface() override;
   void SetNeedsBeginFrame(bool needs_begin_frame) override;
   void SubmitCompositorFrame(const cc::LocalSurfaceId& local_surface_id,
                              cc::CompositorFrame frame) override;
   void BeginFrameDidNotSwap(const cc::BeginFrameAck& begin_frame_ack) override;
 
   // cc::mojom::MojoCompositorFrameSinkPrivate:
   void ClaimTemporaryReference(const cc::SurfaceId& surface_id) override;
   void RequestCopyOfSurface(
       std::unique_ptr<cc::CopyOutputRequest> request) override;
+  void RequestBeginFrames(cc::mojom::FrameSinkObserverPtr observer) override;
 
  private:
   // cc::CompositorFrameSinkSupportClient implementation:
   void DidReceiveCompositorFrameAck(
       const cc::ReturnedResourceArray& resources) override;
   void OnBeginFrame(const cc::BeginFrameArgs& args) override;
   void ReclaimResources(const cc::ReturnedResourceArray& resources) override;
   void WillDrawSurface(const cc::LocalSurfaceId& local_surface_id,
                        const gfx::Rect& damage_rect) override;
 
   void OnClientConnectionLost();
   void OnPrivateConnectionLost();
 
   GpuCompositorFrameSinkDelegate* const delegate_;
   std::unique_ptr<cc::CompositorFrameSinkSupport> support_;
 
   bool client_connection_lost_ = false;
   bool private_connection_lost_ = false;
 
+  cc::mojom::FrameSinkObserverPtr observer_;
+
   cc::mojom::MojoCompositorFrameSinkClientPtr client_;
   mojo::Binding<cc::mojom::MojoCompositorFrameSink>
       compositor_frame_sink_binding_;
   mojo::Binding<cc::mojom::MojoCompositorFrameSinkPrivate>
       compositor_frame_sink_private_binding_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuCompositorFrameSink);
 };
 
 }  // namespace viz
 
 #endif  // COMPONENTS_VIZ_FRAME_SINKS_GPU_COMPOSITOR_FRAME_SINK_H_