Add min and max to Iterable and Stream.

runtime/lib/byte_array.dart

Index: runtime/lib/byte_array.dart
diff --git a/runtime/lib/byte_array.dart b/runtime/lib/byte_array.dart
index 724d92f524b0e5f2f9e56d49e40bd17b85acb6fc..f1358ce5f06b5014f9b8345c6fc1ec81ada6245c 100644
--- a/runtime/lib/byte_array.dart
+++ b/runtime/lib/byte_array.dart
@@ -323,6 +323,10 @@ abstract class _ByteArrayBase {
     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);
+
   void removeRange(int start, int length) {
     throw new UnsupportedError(
         "Cannot remove from a non-extendable array");