Make List.shuffle take an optional Random object to use.

third_party/pkg/js/lib/src/wrapping/js/array_to_list_adapter.dart

Index: third_party/pkg/js/lib/src/wrapping/js/array_to_list_adapter.dart
diff --git a/third_party/pkg/js/lib/src/wrapping/js/array_to_list_adapter.dart b/third_party/pkg/js/lib/src/wrapping/js/array_to_list_adapter.dart
index 617377489183f60b909992e6c39d1dd2c785faf8..6244223e17bf88f39d7726885c7d17299825739a 100644
--- a/third_party/pkg/js/lib/src/wrapping/js/array_to_list_adapter.dart
+++ b/third_party/pkg/js/lib/src/wrapping/js/array_to_list_adapter.dart
@@ -52,8 +52,8 @@ class JsArrayToListAdapter<E> extends TypedProxy /*with ListMixin<E>*/ implement
     final sortedList = _asList()..sort(compare);
     setRange(0, sortedList.length, sortedList);
   }
-  @override void shuffle() {
-    final shuffledList = _asList()..shuffle();
+  @override void shuffle([Random random]) {
+    final shuffledList = _asList()..shuffle(random);
     setRange(0, shuffledList.length, shuffledLength);
   }
   @override void insert(int index, E element) {