Implement aura::WindowPortMus::CreateCompositorFrameSink()

components/viz/client/client_compositor_frame_sink.h

 // Copyright 2017 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_CLIENT_CLIENT_COMPOSITOR_FRAME_SINK_H_
 #define COMPONENTS_VIZ_CLIENT_CLIENT_COMPOSITOR_FRAME_SINK_H_
 
 #include "base/macros.h"
 #include "cc/ipc/mojo_compositor_frame_sink.mojom.h"
 #include "cc/output/compositor_frame_sink.h"
 #include "cc/output/context_provider.h"
 #include "cc/scheduler/begin_frame_source.h"
 #include "cc/surfaces/local_surface_id_allocator.h"
 #include "cc/surfaces/surface_id.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
 namespace viz {
 
 class ClientCompositorFrameSink
     : public cc::CompositorFrameSink,
       public cc::mojom::MojoCompositorFrameSinkClient,
       public cc::ExternalBeginFrameSourceClient {
  public:
+  // If |generate_local_surface_id| is true, a local surface id will be
+  // generated for a new frame with different size, otherwise the
+  // |SetLocalSurfaceId| should be used for providing a valid local surface
+  // id.
   ClientCompositorFrameSink(
       scoped_refptr<cc::ContextProvider> context_provider,
       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
       cc::mojom::MojoCompositorFrameSinkPtrInfo compositor_frame_sink_info,
       cc::mojom::MojoCompositorFrameSinkClientRequest client_request,
-      bool enable_surface_synchronization);
+      bool generate_local_surface_id);
 
   ~ClientCompositorFrameSink() override;
 
+  using SurfaceChangedCallback =
+      base::Callback<void(const cc::LocalSurfaceId&, const gfx::Size&)>;
+  // Set a callback which will be called when the surface is changed.
+  void SetSurfaceChangedCallback(const SurfaceChangedCallback& callback);
+
   // cc::CompositorFrameSink implementation.
   bool BindToClient(cc::CompositorFrameSinkClient* client) override;
   void DetachFromClient() override;
   void SetLocalSurfaceId(const cc::LocalSurfaceId& local_surface_id) override;
   void SubmitCompositorFrame(cc::CompositorFrame frame) override;
   void DidNotProduceFrame(const cc::BeginFrameAck& ack) override;
 
  private:
   // cc::mojom::MojoCompositorFrameSinkClient implementation:
   void DidReceiveCompositorFrameAck(
       const cc::ReturnedResourceArray& resources) override;
   void OnBeginFrame(const cc::BeginFrameArgs& begin_frame_args) override;
   void ReclaimResources(const cc::ReturnedResourceArray& resources) override;
 
   // cc::ExternalBeginFrameSourceClient implementation.
   void OnNeedsBeginFrames(bool needs_begin_frames) override;
 
   gfx::Size last_submitted_frame_size_;
   cc::LocalSurfaceId local_surface_id_;
   cc::LocalSurfaceIdAllocator 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_;
   THREAD_CHECKER(thread_checker_);
-  const bool enable_surface_synchronization_;
+  const bool generate_local_surface_id_;
+
+  SurfaceChangedCallback surface_changed_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientCompositorFrameSink);
 };
 
 }  // namespace viz
 
 #endif  // COMPONENTS_VIZ_CLIENT_CLIENT_COMPOSITOR_FRAME_SINK_H_