gpu: Use mojom API for getting video memory usage.

services/ui/gpu/gpu_service.cc

 // 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.
 
 #include "services/ui/gpu/gpu_service.h"
 
 #include "base/bind.h"
 #include "base/debug/crash_logging.h"
 #include "base/memory/shared_memory.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 109 matching lines @@
 }
 
 void GpuService::DestroyGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
                                         int client_id,
                                         const gpu::SyncToken& sync_token) {
   DCHECK(CalledOnValidThread());
   if (gpu_channel_manager_)
     gpu_channel_manager_->DestroyGpuMemoryBuffer(id, client_id, sync_token);
 }
 
+void GpuService::GetVideoMemoryUsageStats(
+    const GetVideoMemoryUsageStatsCallback& callback) {
+  gpu::VideoMemoryUsageStats video_memory_usage_stats;
+  if (gpu_channel_manager_) {
+    gpu_channel_manager_->gpu_memory_manager()->GetVideoMemoryUsageStats(
+        &video_memory_usage_stats);
+  }
+  callback.Run(video_memory_usage_stats);
+}
+
 void GpuService::DidCreateOffscreenContext(const GURL& active_url) {
   gpu_host_->DidCreateOffscreenContext(active_url);
 }
 
 void GpuService::DidDestroyChannel(int client_id) {
   media_gpu_channel_manager_->RemoveChannel(client_id);
   gpu_host_->DidDestroyChannel(client_id);
 }
 
 void GpuService::DidDestroyOffscreenContext(const GURL& active_url) {
@@ skipping 43 matching lines @@
   mojo::ScopedMessagePipeHandle channel_handle;
   IPC::ChannelHandle handle = gpu_channel_manager_->EstablishChannel(
       client_id, client_tracing_id, preempts, allow_view_command_buffers,
       allow_real_time_streams);
   channel_handle.reset(handle.mojo_handle);
   media_gpu_channel_manager_->AddChannel(client_id);
   callback.Run(std::move(channel_handle));
 }
 
 }  // namespace ui