Add DOMSharedArrayBuffer type

Source/core/dom/DOMArrayBufferBase.h

Index: Source/core/dom/DOMArrayBufferBase.h
diff --git a/Source/core/dom/DOMArrayBufferBase.h b/Source/core/dom/DOMArrayBufferBase.h
new file mode 100644
index 0000000000000000000000000000000000000000..65a768046d76d5516bedc6bf290d57587a7488f1
--- /dev/null
+++ b/Source/core/dom/DOMArrayBufferBase.h
@@ -0,0 +1,54 @@
+// 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 DOMArrayBufferBase_h
+#define DOMArrayBufferBase_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "core/CoreExport.h"
+#include "wtf/ArrayBuffer.h"
+#include "wtf/RefCounted.h"
+
+namespace blink {
+
+class CORE_EXPORT DOMArrayBufferBase : public RefCounted<DOMArrayBufferBase>, public ScriptWrappable {
+public:
+    virtual ~DOMArrayBufferBase() { }
+
+    const WTF::ArrayBuffer* buffer() const { return m_buffer.get(); }
+    WTF::ArrayBuffer* buffer() { return m_buffer.get(); }
+
+    const void* data() const { return buffer()->data(); }
+    void* data() { return buffer()->data(); }
+    unsigned byteLength() const { return buffer()->byteLength(); }
+    bool transfer(WTF::ArrayBufferContents& result) { return buffer()->transfer(result); }
+    bool isNeutered() const { return buffer()->isNeutered(); }
+    bool isShared() const { return buffer()->isShared(); }
+
+    v8::Local<v8::Object> wrap(v8::Isolate*, v8::Local<v8::Object> creationContext) override
+    {
+        ASSERT_NOT_REACHED();
+        return v8::Local<v8::Object>();
+    }
+
+    v8::Local<v8::Object> associateWithWrapper(v8::Isolate*, const WrapperTypeInfo*, v8::Local<v8::Object> wrapper) override
+    {
+        ASSERT_NOT_REACHED();
+        return v8::Local<v8::Object>();
+    }
+
+protected:
+    explicit DOMArrayBufferBase(PassRefPtr<WTF::ArrayBuffer> buffer)
+        : m_buffer(buffer)
+    {
+        ASSERT(m_buffer);
+    }
+
+    RefPtr<WTF::ArrayBuffer> m_buffer;
+};
+
+} // namespace blink
+
+#endif // DOMArrayBuffer_h
+