- Make sure we schedule another wakeup when handling a timeout

runtime/lib/timer_impl.dart

Index: runtime/lib/timer_impl.dart
===================================================================
--- runtime/lib/timer_impl.dart	(revision 44159)
+++ runtime/lib/timer_impl.dart	(working copy)
@@ -115,7 +115,7 @@
 
 class _Timer implements Timer {
   // Cancels the timer in the event handler.
-  static const int _NO_TIMER = -1;
+  static const _NO_TIMER = -1;
 
   // We distinguish what kind of message arrived based on the value being sent.
   static const _ZERO_EVENT = 1;
@@ -129,7 +129,7 @@
 
   // We use an id to be able to sort timers with the same expiration time.
   // ids are recycled after ID_MASK enqueues or when the timer queue is empty.
-  static int _ID_MASK = 0x1fffffff;
+  static const _ID_MASK = 0x1fffffff;
   static int _idCount = 0;
 
   static RawReceivePort _receivePort;
@@ -402,6 +402,7 @@
       assert(pendingTimers.length > 0);
     } else {
       assert(msg == _TIMEOUT_EVENT);
+      _scheduledWakeupTime = null;  // Consumed the last scheduled wakeup now.
       pendingTimers = _queueFromTimeoutEvent();
     }
     _runTimers(pendingTimers);