Add DOMSharedArrayBuffer type

Source/core/dom/DOMSharedArrayBuffer.h

Index: Source/core/dom/DOMSharedArrayBuffer.h
diff --git a/Source/core/dom/DOMSharedArrayBuffer.h b/Source/core/dom/DOMSharedArrayBuffer.h
new file mode 100644
index 0000000000000000000000000000000000000000..9107c9ad3a2d9c1d4380cfb9694216b3bc406eac
--- /dev/null
+++ b/Source/core/dom/DOMSharedArrayBuffer.h
@@ -0,0 +1,48 @@
+// 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 DOMSharedArrayBuffer_h
+#define DOMSharedArrayBuffer_h
+
+#include "core/CoreExport.h"
+#include "core/dom/DOMArrayBufferBase.h"
+#include "wtf/ArrayBuffer.h"
+
+namespace blink {
+
+class CORE_EXPORT DOMSharedArrayBuffer final : public DOMArrayBufferBase {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static PassRefPtr<DOMSharedArrayBuffer> create(PassRefPtr<WTF::ArrayBuffer> buffer)
+    {
+        ASSERT(buffer->isShared());
+        return adoptRef(new DOMSharedArrayBuffer(buffer));
+    }
+    static PassRefPtr<DOMSharedArrayBuffer> create(unsigned numElements, unsigned elementByteSize)
+    {
+        return create(WTF::ArrayBuffer::createShared(numElements, elementByteSize));
+    }
+    static PassRefPtr<DOMSharedArrayBuffer> create(const void* source, unsigned byteLength)
+    {
+        return create(WTF::ArrayBuffer::createShared(source, byteLength));
+    }
+    static PassRefPtr<DOMSharedArrayBuffer> create(WTF::ArrayBufferContents& contents)
+    {
+        ASSERT(contents.isShared());
+        return create(WTF::ArrayBuffer::create(contents));
+    }
+
+    v8::Local<v8::Object> wrap(v8::Isolate*, v8::Local<v8::Object> creationContext) override;
+    v8::Local<v8::Object> associateWithWrapper(v8::Isolate*, const WrapperTypeInfo*, v8::Local<v8::Object> wrapper) override;
+
+private:
+    explicit DOMSharedArrayBuffer(PassRefPtr<WTF::ArrayBuffer> buffer)
+        : DOMArrayBufferBase(buffer)
+    {
+    }
+};
+
+} // namespace blink
+
+#endif // DOMSharedArrayBuffer_h