gpu: Introduce separate mojo api for failed initialization.

content/gpu/gpu_child_thread.h

 // Copyright (c) 2012 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_GPU_GPU_CHILD_THREAD_H_
 #define CONTENT_GPU_GPU_CHILD_THREAD_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 54 matching lines @@
                  DeferredMessages deferred_messages,
                  gpu::GpuMemoryBufferFactory* gpu_memory_buffer_factory);
 
   GpuChildThread(const InProcessChildThreadParams& params,
                  const gpu::GPUInfo& gpu_info,
                  const gpu::GpuFeatureInfo& gpu_feature_info,
                  gpu::GpuMemoryBufferFactory* gpu_memory_buffer_factory);
 
   ~GpuChildThread() override;
 
-  void Shutdown() override;
-
   void Init(const base::Time& process_start_time);
 
  private:
   GpuChildThread(const ChildThreadImpl::Options& options,
                  std::unique_ptr<gpu::GpuWatchdogThread> gpu_watchdog_thread,
                  bool dead_on_arrival,
                  bool in_browser_process,
                  const gpu::GPUInfo& gpu_info,
                  const gpu::GpuFeatureInfo& gpu_feature_info,
                  gpu::GpuMemoryBufferFactory* gpu_memory_buffer_factory);
@@ skipping 56 matching lines @@
   AssociatedInterfaceRegistryImpl associated_interfaces_;
   std::unique_ptr<ui::GpuService> gpu_service_;
   mojo::AssociatedBinding<ui::mojom::GpuMain> gpu_main_binding_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChildThread);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_GPU_GPU_CHILD_THREAD_H_