Sharing of SharedArrayBuffer via PostMessage transfer

Source/wtf/ArrayBuffer.h

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 156 matching lines @@
 PassRefPtr<ArrayBuffer> ArrayBuffer::createShared(unsigned numElements, unsigned elementByteSize, ArrayBufferContents::InitializationPolicy policy)
 {
     ArrayBufferContents contents(numElements, elementByteSize, ArrayBufferContents::Shared, policy);
     RELEASE_ASSERT(contents.data());
     return adoptRef(new ArrayBuffer(contents));
 }
 
 ArrayBuffer::ArrayBuffer(ArrayBufferContents& contents)
     : m_firstView(0), m_isNeutered(false)
 {
-    contents.transfer(m_contents);
+    if (contents.isShared())
+        contents.shareWith(m_contents);
+    else
+        contents.transfer(m_contents);
 }
 
 void* ArrayBuffer::data()
 {
     return m_contents.data();
 }
 
 const void* ArrayBuffer::data() const
 {
     return m_contents.data();
@@ skipping 26 matching lines @@
     if (index < 0)
         index = currentLength + index;
     return clampValue(index, 0, currentLength);
 }
 
 } // namespace WTF
 
 using WTF::ArrayBuffer;
 
 #endif // ArrayBuffer_h