Cleanup GpuMemoryBuffer

content/browser/gpu/browser_gpu_channel_host_factory.cc

Index: content/browser/gpu/browser_gpu_channel_host_factory.cc
diff --git a/content/browser/gpu/browser_gpu_channel_host_factory.cc b/content/browser/gpu/browser_gpu_channel_host_factory.cc
index f4fb185f532cb2c7a4a64bf1da28a67d319c3610..1e4b5802d1ab4b701624a7f6463bc3fdd2ddf474 100644
--- a/content/browser/gpu/browser_gpu_channel_host_factory.cc
+++ b/content/browser/gpu/browser_gpu_channel_host_factory.cc
@@ -309,6 +309,17 @@ CreateCommandBufferResult BrowserGpuChannelHostFactory::CreateViewCommandBuffer(
   return request.result;
 }
 
+void BrowserGpuChannelHostFactory::WaitForPendingGpuMemoryBufferUsageToComplete(
+    const base::Closure& callback) {
+  GpuChannelHost* host = GetGpuChannel();
+  if (!host) {
+    callback.Run();
+    return;
+  }
+
+  host->WaitForPendingGpuMemoryBufferUsageToComplete(callback);
+}
+
 GpuChannelHost* BrowserGpuChannelHostFactory::EstablishGpuChannelSync(
     CauseForGpuLaunch cause_for_gpu_launch) {
   EstablishGpuChannel(cause_for_gpu_launch, base::Closure());