Fix TimeDomain::MigrateQueue with incoming immediate tasks

components/scheduler/base/time_domain.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_SCHEDULER_BASE_TIME_DOMAIN_H_
 #define COMPONENTS_SCHEDULER_BASE_TIME_DOMAIN_H_
 
 #include <map>
 
 #include "base/callback.h"
@@ skipping 71 matching lines @@
   // Schedules a call to TaskQueueImpl::MoveReadyDelayedTasksToDelayedWorkQueue
   // when this TimeDomain reaches |delayed_run_time|.
   void ScheduleDelayedWork(internal::TaskQueueImpl* queue,
                            base::TimeTicks delayed_run_time,
                            base::TimeTicks now);
 
   // Registers the |queue|.
   void RegisterQueue(internal::TaskQueueImpl* queue);
 
   // Removes |queue| from the set of task queues that UpdateWorkQueues calls
-  // UpdateWorkQueue on.
-  void UnregisterAsUpdatableTaskQueue(internal::TaskQueueImpl* queue);
+  // UpdateWorkQueue on. Returns true if |queue| was updatable.
+  bool UnregisterAsUpdatableTaskQueue(internal::TaskQueueImpl* queue);
 
   // Removes |queue| from all internal data structures.
   void UnregisterQueue(internal::TaskQueueImpl* queue);
 
   // Updates active queues associated with this TimeDomain.
   void UpdateWorkQueues(bool should_trigger_wakeup,
                         const internal::TaskQueueImpl::Task* previous_task,
                         LazyNow lazy_now);
 
   // Called by the TaskQueueManager when the TimeDomain is registered.
@@ skipping 44 matching lines @@
   Observer* observer_;  // NOT OWNED.
 
   base::ThreadChecker main_thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(TimeDomain);
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_BASE_TIME_DOMAIN_H_