bindings: Introduces ScriptWrappable::associateWithWrapper in addition to wrap.

Source/bindings/core/v8/ScriptWrappable.h

 /*
  * Copyright (C) 2010 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 102 matching lines @@
     ScriptWrappable() : m_wrapper(0) { }
 
     // Returns the WrapperTypeInfo of the instance.
     //
     // This method must be overridden by DEFINE_WRAPPERTYPEINFO macro.
     virtual const WrapperTypeInfo* wrapperTypeInfo() const = 0;
 
     // Creates and returns a new wrapper object.
     virtual v8::Handle<v8::Object> wrap(v8::Handle<v8::Object> creationContext, v8::Isolate*);
 
+    // Associates the instance with the existing wrapper. Returns |wrapper|.

[haraken, 2014/09/08 08:48:45]

Why does this need to return a wrapper? The returned wrapper should be the same
as the wrapper passed to the method.

[Yuki, 2014/09/08 09:00:22]

Not necessary, it's just convenient that we can
    return associateWithWrapper(...);
instead of
    associateWithWrapper(...);
    return wrapper;

If you don't like this style, I'll change the return type to void.

[haraken, 2014/09/08 09:07:22]

Either is fine with me :)

+    virtual v8::Handle<v8::Object> associateWithWrapper(const WrapperTypeInfo*, v8::Handle<v8::Object> wrapper, v8::Isolate*);
+
     void setWrapper(v8::Handle<v8::Object> wrapper, v8::Isolate* isolate, const WrapperTypeInfo* wrapperTypeInfo)
     {
         ASSERT(!containsWrapper());
         if (!*wrapper) {
             m_wrapper = 0;
             return;
         }
         v8::Persistent<v8::Object> persistent(isolate, wrapper);
         wrapperTypeInfo->configureWrapper(&persistent);
         persistent.SetWeak(this, &setWeakCallback);
@@ skipping 166 matching lines @@
     virtual const WrapperTypeInfo* wrapperTypeInfo() const OVERRIDE \
     { \
         return &s_wrapperTypeInfo; \
     } \
 private: \
     static const WrapperTypeInfo& s_wrapperTypeInfo
 
 } // namespace blink
 
 #endif // ScriptWrappable_h