Refactor List.setRange function.

runtime/lib/typeddata.dart

Index: runtime/lib/typeddata.dart
diff --git a/runtime/lib/typeddata.dart b/runtime/lib/typeddata.dart
index 75f81a7d67d9bf8f475b927cd63db94cf6015536..282577362ca71a4976d6cc57cdd89155d7f0fef7 100644
--- a/runtime/lib/typeddata.dart
+++ b/runtime/lib/typeddata.dart
@@ -546,10 +546,10 @@ abstract class _TypedListBase {
     return IterableMixinWorkaround.getRangeList(this, start, end);
   }
 
-  void setRange(int start, int length, List from, [int startFrom = 0]) {
-    if (!_setRange(start, length, from, startFrom)) {
+  void setRange(int start, int end, Iterable iterable, [int skipCount = 0]) {
+    if (!_setRange(start, end - start, iterable, skipCount)) {
       IterableMixinWorkaround.setRangeList(this, start,
-                                           length, from, startFrom);
+                                           end, iterable, skipCount);
     }
   }
 
@@ -563,7 +563,7 @@ abstract class _TypedListBase {
 
   // Internal utility methods.
 
-  bool _setRange(int start, int length, List from, startFrom)
+  bool _setRange(int start, int length, Iterable from, int startFrom)
       native "TypedData_setRange";
 }