Start an empty interface OffScreenCanvas

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

Index: third_party/WebKit/Source/core/html/canvas/HTMLCanvasElementOffScreenCanvas.h
diff --git a/third_party/WebKit/Source/core/html/canvas/HTMLCanvasElementOffScreenCanvas.h b/third_party/WebKit/Source/core/html/canvas/HTMLCanvasElementOffScreenCanvas.h
new file mode 100644
index 0000000000000000000000000000000000000000..da6f2ef747f715a00e1eb9ab8f0346b9e7d210f7
--- /dev/null
+++ b/third_party/WebKit/Source/core/html/canvas/HTMLCanvasElementOffScreenCanvas.h
@@ -0,0 +1,23 @@
+// 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