Implement WebGL's commit on the main thread

content/browser/renderer_host/offscreen_canvas_compositor_frame_sink_provider_impl.h

+// 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.
+
+#ifndef CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_COMPOSITOR_FRAME_SINK_PROVIDER_IMPL_H_
+#define CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_COMPOSITOR_FRAME_SINK_PROVIDER_IMPL_H_
+
+#include "third_party/WebKit/public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom.h"
+
+namespace content {
+
+class OffscreenCanvasCompositorFrameSinkProviderImpl
+    : public blink::mojom::OffscreenCanvasCompositorFrameSinkProvider {
+ public:
+  OffscreenCanvasCompositorFrameSinkProviderImpl();
+  ~OffscreenCanvasCompositorFrameSinkProviderImpl() override;
+
+  static void Create(
+      blink::mojom::OffscreenCanvasCompositorFrameSinkProviderRequest request);
+
+  // blink::mojom::OffscreenCanvasCompositorFrameSinkProvider implementation.
+  void CreateCompositorFrameSink(
+      const cc::SurfaceId& surface_id,
+      cc::mojom::MojoCompositorFrameSinkClientPtr client,
+      cc::mojom::MojoCompositorFrameSinkRequest request) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(OffscreenCanvasCompositorFrameSinkProviderImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_COMPOSITOR_FRAME_SINK_PROVIDER_IMPL_H_