Start an empty interface OffScreenCanvas

third_party/WebKit/Source/core/html/canvas/HTMLCanvasElementOffScreenCanvas.h

+// Copyright 2015 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 HTMLCanvasElementOffScreenCanvas_h
+#define HTMLCanvasElementOffScreenCanvas_h
+
+#include "wtf/Allocator.h"
+
+namespace blink {
+
+class HTMLCanvasElement;
+class OffScreenCanvas;
+
+class HTMLCanvasElementOffScreenCanvas {
+    STATIC_ONLY(HTMLCanvasElementOffScreenCanvas);
+public:
+    static OffScreenCanvas* transferControlToOffscreen(HTMLCanvasElement&);
+};
+
+} // namespace blink
+
+#endif // HTMLCanvasElementOffScreenCanvas_h