Move throttling of background timers into the renderer scheduler

components/scheduler/base/time_domain.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/time_domain.h"
 
 #include <set>
 
 #include "components/scheduler/base/task_queue_impl.h"
 #include "components/scheduler/base/task_queue_manager_delegate.h"
 #include "components/scheduler/scheduler_export.h"
 
 namespace scheduler {
 
-TimeDomain::TimeDomain() {}
+TimeDomain::TimeDomain(Observer* observer) : observer_(observer) {}
 
 TimeDomain::~TimeDomain() {}
 
 void TimeDomain::UnregisterQueue(internal::TaskQueueImpl* queue) {
   // We need to remove |task_queue| from delayed_wakeup_multimap_ which is a
   // little awkward since it's keyed by time. O(n) running time.
   for (DelayedWakeupMultimap::iterator iter = delayed_wakeup_multimap_.begin();
        iter != delayed_wakeup_multimap_.end();) {
     if (iter->second == queue) {
       DelayedWakeupMultimap::iterator temp = iter;
@@ skipping 39 matching lines @@
 void TimeDomain::ScheduleDelayedWork(internal::TaskQueueImpl* queue,
                                      base::TimeTicks delayed_run_time,
                                      LazyNow* lazy_now) {
   DCHECK(main_thread_checker_.CalledOnValidThread());
 
   if (delayed_wakeup_multimap_.empty() ||
       delayed_run_time < delayed_wakeup_multimap_.begin()->first) {
     base::TimeDelta delay =
         std::max(base::TimeDelta(), delayed_run_time - lazy_now->Now());
     RequestWakeup(lazy_now, delay);
+    if (observer_)
+      observer_->OnTimeDomainHasDelayedWork();
   }
   delayed_wakeup_multimap_.insert(std::make_pair(delayed_run_time, queue));
 }
 
 void TimeDomain::RegisterAsUpdatableTaskQueue(internal::TaskQueueImpl* queue) {
-  base::AutoLock lock(newly_updatable_lock_);
-  newly_updatable_.push_back(queue);
+  {
+    base::AutoLock lock(newly_updatable_lock_);
+    newly_updatable_.push_back(queue);
+  }
+  if (observer_)
+    observer_->OnTimeDomainHasImmediateWork();
 }
 
 void TimeDomain::UnregisterAsUpdatableTaskQueue(
     internal::TaskQueueImpl* queue) {
   DCHECK(main_thread_checker_.CalledOnValidThread());
   MoveNewlyUpdatableQueuesIntoUpdatableQueueSet();
 #ifndef NDEBUG
   {
     base::AutoLock lock(newly_updatable_lock_);
     DCHECK(!(updatable_queue_set_.find(queue) == updatable_queue_set_.end() &&
@@ skipping 77 matching lines @@
   state->SetString("name", GetName());
   state->BeginArray("updatable_queue_set");
   for (auto& queue : updatable_queue_set_)
     state->AppendString(queue->GetName());
   state->EndArray();
   AsValueIntoInternal(state);
   state->EndDictionary();
 }
 
 }  // namespace scheduler