- Move the Timer interface to the dart:isolate library so that it

runtime/bin/timer_impl.dart

Index: runtime/bin/timer_impl.dart
===================================================================
--- runtime/bin/timer_impl.dart	(revision 8601)
+++ runtime/bin/timer_impl.dart	(working copy)
@@ -185,3 +185,15 @@
   bool _repeating;
 }
 
+// Provide a closure which will allocate a Timer object to be able to hook
+// up the Timer interface in dart:isolate with the implementation here.
+_getTimerFactoryClosure() {
+  return (int milliSeconds, void callback(Timer timer), bool repeating) {
+    if (repeating) {
+      return new _Timer.repeating(milliSeconds, callback);
+    }
+    return new _Timer(milliSeconds, callback);
+  };
+}
+
+