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
new file mode 100644
index 0000000000000000000000000000000000000000..cc2b1b172bbd3a4f46c79d6260d471ed806b6bb3
--- /dev/null
+++ b/third_party/WebKit/Source/core/html/canvas/OffScreenCanvas.h
@@ -0,0 +1,39 @@
+// 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/ScriptPromise.h"
+#include "bindings/core/v8/ScriptState.h"
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/CoreExport.h"
+#include "platform/geometry/IntSize.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class CORE_EXPORT OffScreenCanvas final : public GarbageCollectedFinalized<OffScreenCanvas>, public ScriptWrappable {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static OffScreenCanvas* create(unsigned long width, unsigned long height);

[Justin Novosad, 2015/12/03 05:07:59]

'long' keyword is superfluous

[xidachen, 2015/12/03 14:16:17]

Done.

+
+    IntSize size() const { return m_size; }
+    unsigned long width() const { return m_size.width(); }

[Justin Novosad, 2015/12/03 05:07:59]

same here

[xidachen, 2015/12/03 14:16:17]

Done.

+    unsigned long height() const { return m_size.height(); }

[Justin Novosad, 2015/12/03 05:07:59]

same here.

[xidachen, 2015/12/03 14:16:17]

Done.

+
+    void setWidth(unsigned long width) { m_size.setWidth(width); }

[Justin Novosad, 2015/12/03 05:07:59]

No 'long'. Implicit cast of unsigned to int may overflow, need to protect
against that, silently reject the new value if it can't be handled because it is
too large. this should also be tested.

[xidachen, 2015/12/03 14:16:17]

Done.

+    void setHeight(unsigned long height) { m_size.setHeight(height); }
+
+    DECLARE_VIRTUAL_TRACE();
+
+private:
+    OffScreenCanvas(const IntSize&);
+
+    IntSize m_size;
+};
+
+} // namespace blink
+
+#endif // OffScreenCanvas_h