Implement WebGL's commit on the main thread

content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.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 "content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.h"
 
 #include "cc/surfaces/surface.h"
 #include "cc/surfaces/surface_manager.h"
 #include "content/browser/compositor/surface_utils.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
@@ skipping 15 matching lines @@
   }
 }
 
 // static
 void OffscreenCanvasFrameReceiverImpl::Create(
     blink::mojom::OffscreenCanvasFrameReceiverRequest request) {
   mojo::MakeStrongBinding(base::MakeUnique<OffscreenCanvasFrameReceiverImpl>(),
                           std::move(request));
 }
 
+void OffscreenCanvasFrameReceiverImpl::SetClient(
+    blink::mojom::OffscreenCanvasFrameReceiverClientPtr client) {
+  DCHECK(!client_.get());

[dcheng, 2016/09/14 20:02:19]

Nit: the .get() should be unnecessary

+  client_ = std::move(client);
+}
+
 void OffscreenCanvasFrameReceiverImpl::SubmitCompositorFrame(
     const cc::SurfaceId& surface_id,
     cc::CompositorFrame frame) {
   if (!surface_factory_) {
     cc::SurfaceManager* manager = GetSurfaceManager();
     surface_factory_ = base::MakeUnique<cc::SurfaceFactory>(manager, this);
     surface_factory_->Create(surface_id);
 
     GetSurfaceManager()->RegisterSurfaceClientId(surface_id.client_id());
   }
   if (surface_id_.is_null()) {
     surface_id_ = surface_id;
     }
     surface_factory_->SubmitCompositorFrame(surface_id, std::move(frame),
                                             base::Closure());
 }
 
 // TODO(619136): Implement cc::SurfaceFactoryClient functions for resources
 // return.
 void OffscreenCanvasFrameReceiverImpl::ReturnResources(
-    const cc::ReturnedResourceArray& resources) {}
+    const cc::ReturnedResourceArray& resources) {
+  client_->ReturnResources(resources);
+}
 
 void OffscreenCanvasFrameReceiverImpl::WillDrawSurface(
     const cc::SurfaceId& id,
     const gfx::Rect& damage_rect) {}
 
 void OffscreenCanvasFrameReceiverImpl::SetBeginFrameSource(
     cc::BeginFrameSource* begin_frame_source) {}
 
 }  // namespace content