Add C++ implementation of Object.defineProperties

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 6838f275b9643089032532046f816e5335797637..cb00bb2eb106fbb44d25b6ddd511b169a84c11f0 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1827,12 +1827,13 @@ class JSReceiver: public HeapObject {
       Handle<JSReceiver> object);
 
   enum KeyCollectionType { OWN_ONLY, INCLUDE_PROTOS };
+  enum IncludeSymbolNamedProperties { SKIP_SYMBOLS, INCLUDE_SYMBOLS };
 
   // Computes the enumerable keys for a JSObject. Used for implementing
   // "for (n in object) { }".
   MUST_USE_RESULT static MaybeHandle<FixedArray> GetKeys(
-      Handle<JSReceiver> object,
-      KeyCollectionType type);
+      Handle<JSReceiver> object, KeyCollectionType type,
+      IncludeSymbolNamedProperties include_symbols = SKIP_SYMBOLS);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSReceiver);
@@ -2030,7 +2031,7 @@ class JSObject: public JSReceiver {
   // Defines an AccessorPair property on the given object.
   // TODO(mstarzinger): Rename to SetAccessor().
   static MaybeHandle<Object> DefineAccessor(Handle<JSObject> object,
-                                            Handle<Name> name,
+                                            Handle<Object> name,
                                             Handle<Object> getter,
                                             Handle<Object> setter,
                                             PropertyAttributes attributes);