Add an idle task to periodically sweep canceled delayed tasks

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

Index: third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
index 74a311b176169842a5b18c0f8dc41f83d0819383..cbfc90cdd527d88838cf21921758e75ccd0ec4bb 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
@@ -494,5 +494,15 @@ 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