Add Zone support for Timers.

runtime/lib/timer_patch.dart

Index: runtime/lib/timer_patch.dart
diff --git a/runtime/lib/timer_patch.dart b/runtime/lib/timer_patch.dart
index 2db2343720a1e6ad6e14c7f6b9ea351075bbd68d..87026b10c22bbb57143eadc2ed9ea8771c5de7c9 100644
--- a/runtime/lib/timer_patch.dart
+++ b/runtime/lib/timer_patch.dart
@@ -2,27 +2,26 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-patch class Timer {
-  /* patch */ factory Timer(Duration duration, void callback()) {
-    if (_TimerFactory._factory == null) {
-      throw new UnsupportedError("Timer interface not supported.");
-    }
-    int milliseconds = duration.inMilliseconds;
-    if (milliseconds < 0) milliseconds = 0;
-    return _TimerFactory._factory(milliseconds, (_) { callback(); }, false);
+patch Timer _createTimer(Duration duration, void callback()) {
+  if (_TimerFactory._factory == null) {
+    throw new UnsupportedError("Timer interface not supported.");
   }
+  int milliseconds = duration.inMilliseconds;
+  if (milliseconds < 0) milliseconds = 0;
+  return _TimerFactory._factory(milliseconds, (_) { callback(); }, false);
+}
 
-  /* patch */ factory Timer.periodic(Duration duration,
-                                     void callback(Timer timer)) {
-    if (_TimerFactory._factory == null) {
-      throw new UnsupportedError("Timer interface not supported.");
-    }
-    int milliseconds = duration.inMilliseconds;
-    if (milliseconds < 0) milliseconds = 0;
-    return _TimerFactory._factory(milliseconds, callback, true);
+patch Timer _createPeriodicTimer(Duration duration,
+                                 void callback(Timer timer)) {
+  if (_TimerFactory._factory == null) {
+    throw new UnsupportedError("Timer interface not supported.");
   }
+  int milliseconds = duration.inMilliseconds;
+  if (milliseconds < 0) milliseconds = 0;
+  return _TimerFactory._factory(milliseconds, callback, true);
 }
 
+
 typedef Timer _TimerFactoryClosure(int milliseconds,
                                    void callback(Timer timer),
                                    bool repeating);