mus: Use ui::ContextProviderCommandBuffer.

services/ui/public/cpp/context_provider.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 SERVICES_UI_PUBLIC_CPP_CONTEXT_PROVIDER_H_
-#define SERVICES_UI_PUBLIC_CPP_CONTEXT_PROVIDER_H_
-
-#include <stdint.h>
-
-#include <memory>
-
-#include "base/macros.h"
-#include "cc/output/context_provider.h"
-#include "mojo/public/cpp/system/core.h"
-
-namespace gpu {
-class GpuChannelHost;
-}
-
-namespace ui {
-
-class GLES2Context;
-
-class ContextProvider : public cc::ContextProvider {
- public:
-  explicit ContextProvider(scoped_refptr<gpu::GpuChannelHost> gpu_channel_host);
-
-  // cc::ContextProvider implementation.
-  bool BindToCurrentThread() override;
-  gpu::gles2::GLES2Interface* ContextGL() override;
-  gpu::ContextSupport* ContextSupport() override;
-  class GrContext* GrContext() override;
-  cc::ContextCacheController* CacheController() override;
-  void InvalidateGrContext(uint32_t state) override;
-  base::Lock* GetLock() override;
-  gpu::Capabilities ContextCapabilities() override;
-  void SetLostContextCallback(
-      const LostContextCallback& lost_context_callback) override {}
-
- protected:
-  friend class base::RefCountedThreadSafe<ContextProvider>;
-  ~ContextProvider() override;
-
- private:
-  std::unique_ptr<GLES2Context> context_;
-  std::unique_ptr<cc::ContextCacheController> cache_controller_;
-  scoped_refptr<gpu::GpuChannelHost> gpu_channel_host_;
-
-  DISALLOW_COPY_AND_ASSIGN(ContextProvider);
-};
-
-}  // namespace ui
-
-#endif  // SERVICES_UI_PUBLIC_CPP_CONTEXT_PROVIDER_H_