Add min and max to Iterable and Stream.

runtime/lib/growable_array.dart

Index: runtime/lib/growable_array.dart
diff --git a/runtime/lib/growable_array.dart b/runtime/lib/growable_array.dart
index f3a16fe52027e0dedfe9f8ae1bf2ed193d96eb5a..8b212990674a25fdeb3d080e85973c7e7435344d 100644
--- a/runtime/lib/growable_array.dart
+++ b/runtime/lib/growable_array.dart
@@ -161,6 +161,10 @@ class _GrowableObjectArray<T> implements List<T> {
     throw new StateError("More than one element");
   }
 
+  int min([int compare(int a, int b)]) => Collections.min(this, compare);
+
+  int max([int compare(int a, int b)]) => Collections.max(this, compare);
+
   int indexOf(T element, [int start = 0]) {
     return Arrays.indexOf(this, element, start, length);
   }