[es6] Partially implement Reflect.defineProperty.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 1847 matching lines @@
 
   MUST_USE_RESULT static Object* DefineProperty(Isolate* isolate,
                                                 Handle<Object> object,
                                                 Handle<Object> name,
                                                 Handle<Object> attributes);
   MUST_USE_RESULT static Object* DefineProperties(Isolate* isolate,
                                                   Handle<Object> object,
                                                   Handle<Object> properties);
 
   // "virtual" dispatcher to the correct [[DefineOwnProperty]] implementation.
-  static bool DefineOwnProperty(Isolate* isolate, Handle<JSObject> object,
+  static bool DefineOwnProperty(Isolate* isolate, Handle<JSReceiver> object,
                                 Handle<Object> key, PropertyDescriptor* desc,
                                 ShouldThrow should_throw);
 
   static bool OrdinaryDefineOwnProperty(Isolate* isolate,
                                         Handle<JSObject> object,
                                         Handle<Object> key,
                                         PropertyDescriptor* desc,
                                         ShouldThrow should_throw);
   static bool OrdinaryDefineOwnProperty(LookupIterator* it,
                                         PropertyDescriptor* desc,
@@ skipping 8938 matching lines @@
   // (elements + properties) in the current level.
   int levelLength_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyAccumulator);
 };
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_