mus-gpu: Bind GpuMain on the gpu thread.

services/ui/gpu/gpu_service.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_GPU_GPU_SERVICE_H_
 #define SERVICES_UI_GPU_GPU_SERVICE_H_
 
 #include "base/callback.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/task/cancelable_task_tracker.h"
@@ skipping 43 matching lines @@
   ~GpuService() override;
 
   void UpdateGPUInfoFromPreferences(const gpu::GpuPreferences& preferences);
 
   void InitializeWithHost(mojom::GpuHostPtr gpu_host,
                           gpu::GpuProcessActivityFlags activity_flags,
                           gpu::SyncPointManager* sync_point_manager = nullptr,
                           base::WaitableEvent* shutdown_event = nullptr);
   void Bind(mojom::GpuServiceRequest request);
 
+  bool is_initialized() const { return !!gpu_host_; }
+
   media::MediaGpuChannelManager* media_gpu_channel_manager() {
     return media_gpu_channel_manager_.get();
   }
 
   gpu::GpuChannelManager* gpu_channel_manager() {
     return gpu_channel_manager_.get();
   }
 
   gpu::ImageFactory* gpu_image_factory();
 
@@ skipping 122 matching lines @@
 
   base::WeakPtr<GpuService> weak_ptr_;
   base::WeakPtrFactory<GpuService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuService);
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_GPU_GPU_SERVICE_H_