gpu: Use mojom API for getting video memory usage.

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/threading/non_thread_safe.h"
@@ skipping 104 matching lines @@
       gfx::GpuMemoryBufferId id,
       const gfx::Size& size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage,
       int client_id,
       gpu::SurfaceHandle surface_handle,
       const CreateGpuMemoryBufferCallback& callback) override;
   void DestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
                               int client_id,
                               const gpu::SyncToken& sync_token) override;
+  void GetVideoMemoryUsageStats(
+      const GetVideoMemoryUsageStatsCallback& callback) override;
 
   scoped_refptr<base::SingleThreadTaskRunner> io_runner_;
 
   // An event that will be signalled when we shutdown.
   base::WaitableEvent shutdown_event_;
 
   std::unique_ptr<gpu::GpuWatchdogThread> watchdog_thread_;
 
   gpu::GpuMemoryBufferFactory* gpu_memory_buffer_factory_;
 
@@ skipping 15 matching lines @@
   gpu::SyncPointManager* sync_point_manager_ = nullptr;
 
   mojo::BindingSet<mojom::GpuService> bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuService);
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_GPU_GPU_SERVICE_H_