Add v8::Object::CreationContext that works for a persistent handle

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 703963aba128c7b17461b692e6befb448335d1d0..68be06731d0fa0f8d399340f6f0f477d164843da 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -2947,6 +2947,12 @@ class V8_EXPORT Object : public Value {
    */
   Local<Context> CreationContext();
 
+  /** Same as above, but works for Persistents */
+  V8_INLINE static Local<Context> CreationContext(
+      const PersistentBase<Object>& object) {
+    return object.val_->CreationContext();
+  }
+
   /**
    * Checks whether a callback is set by the
    * ObjectTemplate::SetCallAsFunctionHandler method.