Add a ref-counted data holder to ArrayBufferContents

Source/wtf/ArrayBufferView.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 54 matching lines @@
 
     unsigned byteOffset() const
     {
         return m_byteOffset;
     }
 
     virtual unsigned byteLength() const = 0;
 
     void setNeuterable(bool flag) { m_isNeuterable = flag; }
     bool isNeuterable() const { return m_isNeuterable; }
+    bool isShared() const { return m_buffer ? m_buffer->isShared() : false; }
 
     virtual ~ArrayBufferView();
 
   protected:
     ArrayBufferView(PassRefPtr<ArrayBuffer>, unsigned byteOffset);
 
     inline bool setImpl(ArrayBufferView*, unsigned byteOffset);
 
     // Helper to verify that a given sub-range of an ArrayBuffer is
     // within range.
@@ skipping 41 matching lines @@
     char* base = static_cast<char*>(baseAddress());
     memmove(base + byteOffset, array->baseAddress(), array->byteLength());
     return true;
 }
 
 } // namespace WTF
 
 using WTF::ArrayBufferView;
 
 #endif // ArrayBufferView_h