Change getRange to sublist. Make getRange deprecated.

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 4daf8bb9543edb0a003bad6d6443165c5cafe4fb..db020ad7ca18e0ba3ef77b955d15bca014a94dec 100644
--- a/runtime/lib/growable_array.dart
+++ b/runtime/lib/growable_array.dart
@@ -108,15 +108,19 @@ class _GrowableObjectArray<T> implements List<T> {
     }
   }
 
-  List<T> getRange(int start, int length) {
-    if (length == 0) return [];
-    Arrays.rangeCheck(this, start, length);
+  List<T> sublist(int start, [int end]) {
+    Arrays.indicesCheck(this, start, end);
+    if (end == null) end = length;
+    int length = end - start;
+    if (start == end) return <T>[];
     List list = new _GrowableObjectArray<T>.withCapacity(length);
     list.length = length;
     Arrays.copy(this, start, list, 0, length);
     return list;
   }
 
+  List<T> getRange(int start, int length) => sublist(start, start + length);
+
   factory _GrowableObjectArray(int length) {
     var data = new _ObjectArray((length == 0) ? 4 : length);
     var result = new _GrowableObjectArray<T>.withData(data);