Reduce the number of delayed tasks on chromium run loop

components/scheduler/base/task_queue_impl.cc

 // 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.
 
 #include "components/scheduler/base/task_queue_impl.h"
 
 #include "components/scheduler/base/task_queue_manager.h"
 #include "components/scheduler/base/task_queue_manager_delegate.h"
 #include "components/scheduler/base/time_domain.h"
 
@@ skipping 307 matching lines @@
   TraceQueueSize(true);
 }
 
 // TODO(alexclarke): Consider merging EnqueueTaskLocked &
 //  EnqueueDelayedTaskLocked.
 void TaskQueueImpl::EnqueueDelayedTaskLocked(const Task& pending_task) {
   if (!any_thread().task_queue_manager)
     return;
   if (any_thread().incoming_queue.empty())
     any_thread().time_domain->RegisterAsUpdatableTaskQueue(this);
-  if (any_thread().pump_policy == PumpPolicy::AUTO &&
-      any_thread().incoming_queue.empty()) {
-    any_thread().task_queue_manager->MaybePostDoWorkOnMainRunner();
-  }
   // TODO(alexclarke): consider std::move() when allowed.
   any_thread().incoming_queue.push(pending_task);
   any_thread().incoming_queue.back().set_enqueue_order(
       any_thread().task_queue_manager->GetNextSequenceNumber());
   TraceQueueSize(true);
 }
 
 void TaskQueueImpl::SetPumpPolicy(PumpPolicy pump_policy) {
   base::AutoLock lock(any_thread_lock_);
   if (pump_policy == PumpPolicy::AUTO &&
@@ skipping 213 matching lines @@
   state->EndDictionary();
 }
 
 size_t TaskQueueImpl::IncomingQueueSizeForTest() const {
   base::AutoLock lock(any_thread_lock_);
   return any_thread().incoming_queue.size();
 }
 
 }  // namespace internal
 }  // namespace scheduler