Implement OffscreenCanvas Accelerated 2D commit()

third_party/WebKit/Source/platform/graphics/OffscreenCanvasFrameDispatcherImpl.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 OffscreenCanvasFrameDispatcherImpl_h
 #define OffscreenCanvasFrameDispatcherImpl_h
 
 #include "cc/ipc/mojo_compositor_frame_sink.mojom-blink.h"
 #include "cc/surfaces/surface_id.h"
 #include "mojo/public/cpp/bindings/binding.h"
@@ skipping 13 matching lines @@
     ~OffscreenCanvasFrameDispatcherImpl() override {}
     void dispatchFrame(RefPtr<StaticBitmapImage>) override;
 
     // cc::mojom::blink::MojoCompositorFrameSinkClient implementation.
     void ReturnResources(Vector<cc::mojom::blink::ReturnedResourcePtr> resources) override;
 
 private:
     const cc::SurfaceId m_surfaceId;
     const int m_width;
     const int m_height;
+
+    unsigned m_nextResourceId;
+    HashMap<unsigned, RefPtr<StaticBitmapImage>> m_cachedImages;
+
+    bool verifyImageSize(const sk_sp<SkImage>&);
+
     cc::mojom::blink::MojoCompositorFrameSinkPtr m_sink;
-
-    HashMap<unsigned, RefPtr<StaticBitmapImage>> m_cachedImages;
     mojo::Binding<cc::mojom::blink::MojoCompositorFrameSinkClient> m_binding;
 };
 
 } // namespace blink
 
 #endif // OffscreenCanvasFrameDispatcherImpl_h