Reland: Reland: Implement new Blink IDL attribute [SetReference]

Source/bindings/v8/DOMWrapperMap.h

 /*
  * Copyright (C) 2012 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 31 matching lines @@
 template<class KeyType>
 class DOMWrapperMap {
 public:
     typedef HashMap<KeyType*, UnsafePersistent<v8::Object> > MapType;
 
     explicit DOMWrapperMap(v8::Isolate* isolate)
         : m_isolate(isolate)
     {
     }
 
+    // FIXME: rewrite other methods to use this?
+    UnsafePersistent<v8::Object> get(KeyType* key)
+    {
+        return m_map.get(key);
+    }
+
     v8::Handle<v8::Object> newLocal(KeyType* key, v8::Isolate* isolate)
     {
         return m_map.get(key).newLocal(isolate);
     }
 
     bool setReturnValueFrom(v8::ReturnValue<v8::Value> returnValue, KeyType* key)
     {
         typename MapType::iterator it = m_map.find(key);
         if (it == m_map.end())
             return false;
@@ skipping 63 matching lines @@
     ASSERT(type->derefObjectFunction);
     void* key = static_cast<void*>(toNative(*wrapper));
     ASSERT(*(map->m_map.get(key).persistent()) == *wrapper);
     map->removeAndDispose(key);
     type->derefObject(key);
 }
 
 } // namespace WebCore
 
 #endif // DOMWrapperMap_h