services/ui: Use a gpu::GpuChannelHost when creating ui::OutputSurface.

services/ui/public/cpp/gles2_context.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_GLES2_CONTEXT_H_
 #define SERVICES_UI_PUBLIC_CPP_GLES2_CONTEXT_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
 
 namespace gpu {
+
 class CommandBufferProxyImpl;
+class GpuChannelHost;
 class TransferBuffer;
+
 namespace gles2 {
 class GLES2CmdHelper;
 }
-}
+
+}  // namespace gpu
 
 namespace ui {
 
-class GpuService;
-
 class GLES2Context {
  public:
   ~GLES2Context();
   gpu::gles2::GLES2Interface* interface() const {
     return implementation_.get();
   }
   gpu::ContextSupport* context_support() const { return implementation_.get(); }
 
   static std::unique_ptr<GLES2Context> CreateOffscreenContext(
-      GpuService* gpu_service);
+      scoped_refptr<gpu::GpuChannelHost> gpu_channel_host);
 
  private:
   GLES2Context();
-  bool Initialize(GpuService* gpu_service);
+  bool Initialize(scoped_refptr<gpu::GpuChannelHost> gpu_channel_host);
 
   std::unique_ptr<gpu::CommandBufferProxyImpl> command_buffer_proxy_impl_;
   std::unique_ptr<gpu::gles2::GLES2CmdHelper> gles2_helper_;
   std::unique_ptr<gpu::TransferBuffer> transfer_buffer_;
   std::unique_ptr<gpu::gles2::GLES2Implementation> implementation_;
 
   DISALLOW_COPY_AND_ASSIGN(GLES2Context);
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_PUBLIC_CPP_GLES2_CONTEXT_H_