Stop notification updates from unpausing toast timers.

ui/message_center/popup_timers_controller.cc

Index: ui/message_center/popup_timers_controller.cc
diff --git a/ui/message_center/popup_timers_controller.cc b/ui/message_center/popup_timers_controller.cc
index aae50daf81b5d56a6449febf8e4fc49af2f5009e..a967681d1f01048f987d5b91534d20d74ffc7ccf 100644
--- a/ui/message_center/popup_timers_controller.cc
+++ b/ui/message_center/popup_timers_controller.cc
@@ -100,8 +100,20 @@ void PopupTimersController::OnNotificationUpdated(const std::string& id) {
     return;
   }
 
+  auto timer = popup_timers_.find(id);
+  // The timer must already have been started and not be running. Relies on
+  // the invariant that |popup_timers_| only contains timers that have been
+  // started.
+  bool was_paused = timer != popup_timers_.end() && !timer->second->IsRunning();
   CancelTimer(id);
   StartTimer(id, GetTimeoutForNotification(*iter));
+
+  // If a timer was paused before, pause it afterwards as well.
+  // See crbug.com/710298
+  if (was_paused) {
+    auto timer = popup_timers_.find(id);
+    timer->second->Pause();
+  }
 }
 
 void PopupTimersController::OnNotificationRemoved(const std::string& id,