relnote: Use NotifyChangedPriority when updating alarms instead of canceling and reregistering. Gua…

net/quic/quic_alarm.h

Index: net/quic/quic_alarm.h
diff --git a/net/quic/quic_alarm.h b/net/quic/quic_alarm.h
index ed492cfeb009a31a3bc92547ad984904deb7a789..14b70a375364e5d7e5cc6864d722bfe48d203671 100644
--- a/net/quic/quic_alarm.h
+++ b/net/quic/quic_alarm.h
@@ -63,6 +63,11 @@ class NET_EXPORT_PRIVATE QuicAlarm {
   // cancelation of the alarm.
   virtual void CancelImpl() = 0;
 
+  // Subclasses implement this method to perform the platform-specific update of
+  // the alarm if there exists a more optimal implementation than calling
+  // CancelImpl() and SetImpl().
+  virtual void UpdateImpl();
+
   // Called by subclasses when the alarm fires.  Invokes the
   // delegates |OnAlarm| if a delegate is set, and if the deadline
   // has been exceeded.  Implementations which do not remove the