Start an empty interface OffScreenCanvas

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

+// 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.
+
+#include "config.h"
+#include "core/html/canvas/OffScreenCanvas.h"
+
+#include "core/frame/ImageBitmap.h"
+
+namespace blink {
+
+OffScreenCanvas* OffScreenCanvas::create(unsigned long width, unsigned long height)
+{
+    return nullptr;
+}
+
+void OffScreenCanvas::setWidth(unsigned long width)
+{
+    m_size.setWidth(width);
+}
+
+void OffScreenCanvas::setHeight(unsigned long height)
+{
+    m_size.setHeight(height);
+}
+
+PassRefPtrWillBeRawPtr<ImageBitmap> OffScreenCanvas::transferToImageBitmap()
+{
+    return nullptr;
+}
+
+OffScreenCanvas::OffScreenCanvas(const IntSize& size)
+    : m_size(size)
+{
+}
+
+DEFINE_TRACE(OffScreenCanvas)
+{
+}
+
+} // namespace blink