Prevent redundant DoWorks due to 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 db351c79c3fe52a81049d8c2679f2e014581a695..bcc4f868aac5fbc1a99520620306b20366349773 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
@@ -190,10 +190,14 @@ void TaskQueueManager::MaybeScheduleDelayedWork(
     return;
   }
 
-  // De-duplicate DoWork posts.
+  // Only request the wake up if, either there are no wake ups scheduled, or if
+  // its sooner than any previously requested wake up.
   base::TimeTicks run_time = now + delay;
-  if (!main_thread_pending_wakeups_.insert(run_time).second)
+  if (!main_thread_pending_wakeups_.empty() &&
+      *main_thread_pending_wakeups_.begin() <= run_time) {
     return;
+  }
+  main_thread_pending_wakeups_.insert(run_time);
   delegate_->PostDelayedTask(
       from_here, base::Bind(&TaskQueueManager::DoWork,
                             weak_factory_.GetWeakPtr(), run_time, true),