ES6 symbols: extend V8 API to support symbols

src/handles.cc

Index: src/handles.cc
diff --git a/src/handles.cc b/src/handles.cc
index b24a4cd1d8b541bb95561e2f684122ccbc9be456..3de4f5d9f92f6037a16384df316caf1c1a03558d 100644
--- a/src/handles.cc
+++ b/src/handles.cc
@@ -252,15 +252,32 @@ Handle<Object> ForceSetProperty(Handle<JSObject> object,
 }
 
 
+Handle<Object> DeleteProperty(Handle<JSObject> object, Handle<Object> key) {
+  Isolate* isolate = object->GetIsolate();
+  CALL_HEAP_FUNCTION(isolate,
+                     Runtime::DeleteObjectProperty(
+                         isolate, object, key, JSReceiver::NORMAL_DELETION),
+                     Object);
+}
+
+
 Handle<Object> ForceDeleteProperty(Handle<JSObject> object,
                                    Handle<Object> key) {
   Isolate* isolate = object->GetIsolate();
   CALL_HEAP_FUNCTION(isolate,
-                     Runtime::ForceDeleteObjectProperty(isolate, object, key),
+                     Runtime::DeleteObjectProperty(
+                         isolate, object, key, JSReceiver::FORCE_DELETION),
                      Object);
 }
 
 
+Handle<Object> HasProperty(Handle<JSReceiver> obj, Handle<Object> key) {
+  Isolate* isolate = obj->GetIsolate();
+  CALL_HEAP_FUNCTION(isolate,
+                     Runtime::HasObjectProperty(isolate, obj, key), Object);
+}
+
+
 Handle<Object> GetProperty(Handle<JSReceiver> obj,
                            const char* name) {
   Isolate* isolate = obj->GetIsolate();