Plumb GpuSwapBuffers completion from Mus GPU thread to WS thread

components/mus/gles2/command_buffer_impl.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 COMPONENTS_MUS_GLES2_COMMAND_BUFFER_IMPL_H_
 #define COMPONENTS_MUS_GLES2_COMMAND_BUFFER_IMPL_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
+#include "components/mus/gles2/command_buffer_driver.h"
 #include "components/mus/public/interfaces/command_buffer.mojom.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
 namespace mus {
 
 class CommandBufferDriver;
 class GpuState;
 
 // This class listens to the CommandBuffer message pipe on a low-latency thread
 // so that we can insert sync points without blocking on the GL driver. It
 // forwards most method calls to the CommandBufferDriver, which runs on the
 // same thread as the native viewport.
-class CommandBufferImpl : public mojom::CommandBuffer {
+class CommandBufferImpl : public mojom::CommandBuffer,
+                          public CommandBufferDriver::Client {
  public:
   CommandBufferImpl(mojo::InterfaceRequest<CommandBuffer> request,
                     scoped_refptr<GpuState> gpu_state);
-  void DidLoseContext(uint32_t reason);
 
  private:
   class CommandBufferDriverClientImpl;
   ~CommandBufferImpl() override;
 
+  // CommandBufferDriver::Client. All called on the GPU thread.
+  void DidLoseContext(uint32_t reason) override;
+  void UpdateVSyncParameters(int64_t timebase, int64_t interval) override;
+  void OnGpuCompletedSwapBuffers(gfx::SwapResult result) override;
+
   // mojom::CommandBuffer:
   void Initialize(
       mojom::CommandBufferClientPtr client,
       mojo::ScopedSharedBufferHandle shared_state,
       mojo::Array<int32_t> attribs,
       const mojom::CommandBuffer::InitializeCallback& callback) override;
   void SetGetBuffer(int32_t buffer) override;
   void Flush(int32_t put_offset) override;
   void MakeProgress(
       int32_t last_get_offset,
@@ skipping 61 matching lines @@
   scoped_ptr<CommandBufferDriver> driver_;
   scoped_ptr<mojo::Binding<CommandBuffer>> binding_;
   mojom::CommandBufferClientPtr client_;
 
   DISALLOW_COPY_AND_ASSIGN(CommandBufferImpl);
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_GLES2_COMMAND_BUFFER_IMPL_H_