Add an idle task to periodically sweep canceled delayed tasks

third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc

 // Copyright 2014 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.
 
 #include "platform/scheduler/base/task_queue_manager.h"
 
 #include <queue>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 476 matching lines @@
   if (observer_) {
     observer_->OnTriedToExecuteBlockedTask(*work_queue->task_queue(),
                                            *work_queue->GetFrontTask());
   }
 }
 
 bool TaskQueueManager::HasImmediateWorkForTesting() const {
   return !selector_.EnabledWorkQueuesEmpty();
 }
 
+void TaskQueueManager::SweepCanceledDelayedTasks() {
+  std::map<TimeDomain*, base::TimeTicks> time_domain_now;
+  for (const scoped_refptr<internal::TaskQueueImpl>& queue : queues_) {
+    TimeDomain* time_domain = queue->GetTimeDomain();
+    if (time_domain_now.find(time_domain) == time_domain_now.end())
+      time_domain_now.insert(std::make_pair(time_domain, time_domain->Now()));
+    queue->SweepCanceledDelayedTasks(time_domain_now[time_domain]);
+  }
+}
+
 }  // namespace scheduler
 }  // namespace blink