gpu: Add GpuFence framework.

services/ui/ws/mus_gpu_memory_buffer_manager.h

 // Copyright 2016 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_WS_MUS_GPU_MEMORY_BUFFER_MANAGER_H_
 #define SERVICES_UI_WS_MUS_GPU_MEMORY_BUFFER_MANAGER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 21 matching lines @@
       const gfx::Size& size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage,
       gpu::SurfaceHandle surface_handle) override;
   std::unique_ptr<gfx::GpuMemoryBuffer> CreateGpuMemoryBufferFromHandle(
       const gfx::GpuMemoryBufferHandle& handle,
       const gfx::Size& size,
       gfx::BufferFormat format) override;
   void SetDestructionSyncToken(gfx::GpuMemoryBuffer* buffer,
                                const gpu::SyncToken& sync_token) override;
+  std::unique_ptr<gfx::GpuFence> CreateGpuFence() override;
+  std::unique_ptr<gfx::GpuFence> CreateGpuFenceFromHandle(
+      const gfx::GpuFenceHandle& handle) override;
+  gfx::GpuFence* GpuFenceFromClientFence(ClientFence fence) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MusGpuMemoryBufferManager);
 
   void DestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
                               int client_id,
                               bool is_native,
                               const gpu::SyncToken& sync_token);
 
   mojom::GpuServiceInternal* gpu_service_;
   const int client_id_;
   base::WeakPtrFactory<MusGpuMemoryBufferManager> weak_factory_;
 };
 
 }  // namespace ws
 }  // namespace ui
 
 #endif  // SERVICES_UI_WS_MUS_GPU_MEMORY_BUFFER_MANAGER_H_