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

Source/bindings/v8/UnsafePersistent.h

Index: Source/bindings/v8/UnsafePersistent.h
diff --git a/Source/bindings/v8/UnsafePersistent.h b/Source/bindings/v8/UnsafePersistent.h
index 6f512a26f299e2689e08532e476710423266e52b..d1aa957472ce550f11db4cb370854f98e95934ac 100644
--- a/Source/bindings/v8/UnsafePersistent.h
+++ b/Source/bindings/v8/UnsafePersistent.h
@@ -88,6 +88,12 @@ public:
         return handle;
     }
 
+    void setReferenceFrom(const v8::Persistent<v8::Object>& parent, v8::Isolate* isolate)
+    {
+        // FIXME: remove As() after v8 roll.

[haraken, 2013/10/29 01:14:53]

Hasn't the V8 roll already done?

[kouhei (in TOK), 2013/10/29 04:19:58]

Done.

+        isolate->SetReference(parent, persistent()->template As<v8::Value>());
+    }
+
     void dispose()
     {
         persistent()->Dispose();