Refactor List.setRange function.

sdk/lib/collection/collections.dart

Index: sdk/lib/collection/collections.dart
diff --git a/sdk/lib/collection/collections.dart b/sdk/lib/collection/collections.dart
index a5cbfafd7d495f909b914f71b9e9365b29153603..54c7d0bc33d480fd47aa936c1cc8755be62c5fed 100644
--- a/sdk/lib/collection/collections.dart
+++ b/sdk/lib/collection/collections.dart
@@ -369,16 +369,18 @@ class IterableMixinWorkaround {
     return new SubListIterable(list, start, end);
   }
 
-  static void setRangeList(List list, int start, int length,
+  static void setRangeList(List list, int start, int end,
                            List from, int startFrom) {
-    if (length == 0) return;
-
-    if (length < 0) throw new ArgumentError(length);
-    if (start < 0) throw new RangeError.value(start);
-    if (start + length > list.length) {
-      throw new RangeError.value(start + length);
+    if (start < 0 || start > list.length) {
+      throw new RangeError.range(start, 0, list.length);
+    }
+    if (end < start || end > list.length) {
+      throw new RangeError.range(end, start, list.length);
+    }
+    int length = end - start;
+    if (startFrom < 0 || startFrom + length > from.length) {
+      throw new RangeError.range(startFrom, 0, from.length - length);
     }
-
     Arrays.copy(from, startFrom, list, start, length);
   }