Implement WebGL's commit on the main thread

content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.cc

Index: content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.cc
diff --git a/content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.cc b/content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.cc
index 3496764baec403ba23da29e3d3fff80ec13343b2..b6088b9563b497dfd9c8d4429cd31d5348aa75ff 100644
--- a/content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.cc
+++ b/content/browser/renderer_host/offscreen_canvas_frame_receiver_impl.cc
@@ -33,6 +33,12 @@ void OffscreenCanvasFrameReceiverImpl::Create(
                           std::move(request));
 }
 
+void OffscreenCanvasFrameReceiverImpl::SetClient(
+    blink::mojom::OffscreenCanvasFrameReceiverClientPtr client) {
+  DCHECK(!client_.get());
+  client_ = std::move(client);
+}
+
 void OffscreenCanvasFrameReceiverImpl::SubmitCompositorFrame(
     const cc::SurfaceId& surface_id,
     cc::CompositorFrame frame) {
@@ -53,7 +59,9 @@ void OffscreenCanvasFrameReceiverImpl::SubmitCompositorFrame(
 // 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,