Add debug mirror support for ES6 Map/Set iterators.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 5abd0eb5e52a52d6676a5fcf44fdee03a0643d61..0a7aa581da15c2bcde1c9e122335d00365e41f7a 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -2569,6 +2569,16 @@ bool Value::IsGeneratorObject() const {
 }
 
 
+bool Value::IsMapIterator() const {
+  return Utils::OpenHandle(this)->IsJSMapIterator();
+}
+
+
+bool Value::IsSetIterator() const {
+  return Utils::OpenHandle(this)->IsJSSetIterator();
+}
+
+
 Local<String> Value::ToString(Isolate* v8_isolate) const {
   i::Handle<i::Object> obj = Utils::OpenHandle(this);
   i::Handle<i::Object> str;