Start an empty interface OffScreenCanvas

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

Index: third_party/WebKit/Source/core/html/canvas/OffScreenCanvas.cpp
diff --git a/third_party/WebKit/Source/core/html/canvas/OffScreenCanvas.cpp b/third_party/WebKit/Source/core/html/canvas/OffScreenCanvas.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..94e7e62b5b49b249b820b22e0a1aa62649bb3c56
--- /dev/null
+++ b/third_party/WebKit/Source/core/html/canvas/OffScreenCanvas.cpp
@@ -0,0 +1,36 @@
+// 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 "wtf/MathExtras.h"
+
+namespace blink {
+
+OffScreenCanvas* OffScreenCanvas::create(unsigned width, unsigned height)
+{
+    return new OffScreenCanvas(IntSize(clampTo<int>(width), clampTo<int>(height)));
+}
+
+void OffScreenCanvas::setWidth(unsigned width)
+{
+    m_size.setWidth(clampTo<int>(width));
+}
+
+void OffScreenCanvas::setHeight(unsigned height)
+{
+    m_size.setHeight(clampTo<int>(height));
+}
+
+OffScreenCanvas::OffScreenCanvas(const IntSize& size)
+    : m_size(size)
+{
+}
+
+DEFINE_TRACE(OffScreenCanvas)
+{
+}
+
+} // namespace blink