Implement WebGL's commit on the main thread

content/browser/renderer_host/offscreen_canvas_compositor_frame_sink_provider_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_compositor_frame_sink_provider_impl.h"
+
+#include "content/browser/renderer_host/offscreen_canvas_compositor_frame_sink.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace content {
+
+OffscreenCanvasCompositorFrameSinkProviderImpl::
+    OffscreenCanvasCompositorFrameSinkProviderImpl() {}
+
+OffscreenCanvasCompositorFrameSinkProviderImpl::
+    ~OffscreenCanvasCompositorFrameSinkProviderImpl() {}
+
+// static
+void OffscreenCanvasCompositorFrameSinkProviderImpl::Create(
+    blink::mojom::OffscreenCanvasCompositorFrameSinkProviderRequest request) {
+  mojo::MakeStrongBinding(
+      base::MakeUnique<OffscreenCanvasCompositorFrameSinkProviderImpl>(),
+      std::move(request));
+}
+
+void OffscreenCanvasCompositorFrameSinkProviderImpl::CreateCompositorFrameSink(
+    const cc::SurfaceId& surface_id,
+    cc::mojom::MojoCompositorFrameSinkClientPtr client,
+    cc::mojom::MojoCompositorFrameSinkRequest request) {
+  OffscreenCanvasCompositorFrameSink::Create(surface_id, std::move(client),
+                                             std::move(request));
+}
+
+}  // namespace content