gpu: Notify callbacks the reason for channel creation failure

content/browser/gpu/gpu_client.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 CONTENT_BROWSER_GPU_GPU_CLIENT_H_
 #define CONTENT_BROWSER_GPU_GPU_CLIENT_H_
 
 #include "base/memory/weak_ptr.h"
+#include "content/browser/gpu/gpu_process_host.h"
 #include "ipc/ipc_channel_handle.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "services/ui/public/interfaces/gpu.mojom.h"
 
 namespace content {
 
 class GpuClient : public ui::mojom::Gpu {
  public:
   explicit GpuClient(int render_process_id);
   ~GpuClient() override;
 
   void Add(ui::mojom::GpuRequest request);
 
  private:
   void OnError();
   void OnEstablishGpuChannel(const EstablishGpuChannelCallback& callback,
                              const IPC::ChannelHandle& channel,
-                             const gpu::GPUInfo& gpu_info);
+                             const gpu::GPUInfo& gpu_info,
+                             GpuProcessHost::EstablishChannelStatus status);
   void OnCreateGpuMemoryBuffer(const CreateGpuMemoryBufferCallback& callback,
                                const gfx::GpuMemoryBufferHandle& handle);
 
   // ui::mojom::Gpu overrides:
   void EstablishGpuChannel(
       const EstablishGpuChannelCallback& callback) override;
   void CreateGpuMemoryBuffer(
       gfx::GpuMemoryBufferId id,
       const gfx::Size& size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage,
       const ui::mojom::Gpu::CreateGpuMemoryBufferCallback& callback) override;
   void DestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
                               const gpu::SyncToken& sync_token) override;
 
   const int render_process_id_;
   mojo::BindingSet<ui::mojom::Gpu> bindings_;
   base::WeakPtrFactory<GpuClient> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuClient);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GPU_GPU_CLIENT_H_