Implement WebGL's commit on the main thread

third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.h

Index: third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.h
diff --git a/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.h b/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.h
index 33ea9da2a4b7fc14b74c3925ced02916b56e582e..9eade1470306e7e04ad30f1b7726582ba22049f0 100644
--- a/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.h
+++ b/third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.h
@@ -6,25 +6,34 @@
 #define OffscreenCanvasFrameDispatcherImpl_h
 
 #include "cc/surfaces/surface_id.h"
+#include "mojo/public/cpp/bindings/binding.h"
 #include "platform/graphics/OffscreenCanvasFrameDispatcher.h"
+#include "platform/graphics/StaticBitmapImage.h"
 #include "public/platform/modules/offscreencanvas/offscreen_canvas_surface.mojom-blink.h"
 #include <memory>
 
 namespace blink {
 
-class PLATFORM_EXPORT OffscreenCanvasFrameDispatcherImpl final : public OffscreenCanvasFrameDispatcher {
+class PLATFORM_EXPORT OffscreenCanvasFrameDispatcherImpl final : public OffscreenCanvasFrameDispatcher, public mojom::blink::OffscreenCanvasFrameReceiverClient {
 public:
     explicit OffscreenCanvasFrameDispatcherImpl(uint32_t clientId, uint32_t localId, uint64_t nonce, int width, int height);
 
     // OffscreenCanvasFrameDispatcher implementation.
     ~OffscreenCanvasFrameDispatcherImpl() override {}
-    void dispatchFrame() override;
+    void dispatchFrame(RefPtr<StaticBitmapImage>) override;
+
+    // OffscreenCanvasFrameReceiverClient implementation.
+    void ReturnResources(Vector<cc::mojom::blink::ReturnedResourcePtr> resources) override;
 
 private:
     const cc::SurfaceId m_surfaceId;
     const int m_width;
     const int m_height;
     mojom::blink::OffscreenCanvasFrameReceiverPtr m_service;
+
+    unsigned m_nextResourceId;
+    HashMap<unsigned, RefPtr<StaticBitmapImage>> m_cachedImages;
+    mojo::Binding<mojom::blink::OffscreenCanvasFrameReceiverClient> m_binding;
 };
 
 } // namespace blink