Start an empty interface OffScreenCanvas

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

Index: third_party/WebKit/Source/core/html/canvas/OffScreenCanvas.h
diff --git a/third_party/WebKit/Source/core/html/canvas/OffScreenCanvas.h b/third_party/WebKit/Source/core/html/canvas/OffScreenCanvas.h
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+++ b/third_party/WebKit/Source/core/html/canvas/OffScreenCanvas.h
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+// 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 OffScreenCanvas_h
+#define OffScreenCanvas_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/CoreExport.h"
+#include "platform/geometry/IntSize.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class ImageBitmap;
+
+class CORE_EXPORT OffScreenCanvas final : public GarbageCollectedFinalized<OffScreenCanvas>, public ScriptWrappable {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static OffScreenCanvas* create(unsigned long width, unsigned long height);
+
+    IntSize size() const { return m_size; }
+    unsigned long width() const { return m_size.width(); }
+    unsigned long height() const { return m_size.height(); }
+
+    void setWidth(unsigned long);
+    void setHeight(unsigned long);
+
+    PassRefPtrWillBeRawPtr<ImageBitmap> transferToImageBitmap();
+
+    DECLARE_VIRTUAL_TRACE();
+
+private:
+    OffScreenCanvas(const IntSize&);
+
+    IntSize m_size;
+};
+
+} // namespace blink
+
+#endif // OffScreenCanvas_h