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

pkg/analyzer_experimental/lib/src/generated/java_core.dart

 library java.core;
 
 import "dart:math" as math;
 import "dart:collection" show ListBase;
 
 class JavaSystem {
   static int currentTimeMillis() {
     return (new DateTime.now()).millisecondsSinceEpoch;
   }
 
@@ skipping 358 matching lines @@
   }
 
   void setAll(int index, Iterable<E> iterable) {
     elements.setAll(index, iterable);
   }
 
   void sort([int compare(E a, E b)]) {
     elements.sort(compare);
   }
 
-  void shuffle() {
-    elements.shuffle();
+  void shuffle([math.Random random]) {
+    elements.shuffle(random);
   }
 
   int indexOf(E element, [int start = 0]) {
     return elements.indexOf(element, start);
   }
 
   void insert(int index, E element) {
     elements.insert(index, element);
   }
 
@@ skipping 190 matching lines @@
     if (!_matches.moveNext()) {
       return false;
     }
     _match = _matches.current;
     return true;
   }
   String group(int i) => _match[i];
   int start() => _match.start;
   int end() => _match.end;
 }