Move throttling of background timers into the renderer scheduler

components/scheduler/base/time_domain.cc

Index: components/scheduler/base/time_domain.cc
diff --git a/components/scheduler/base/time_domain.cc b/components/scheduler/base/time_domain.cc
index 2abfb522ce86f0d788285b03eb3127d4f1f56de9..4d94add6d04e5bbe241a39b42d7cdc338c6ee986 100644
--- a/components/scheduler/base/time_domain.cc
+++ b/components/scheduler/base/time_domain.cc
@@ -12,7 +12,7 @@
 
 namespace scheduler {
 
-TimeDomain::TimeDomain() {}
+TimeDomain::TimeDomain(Observer* observer) : observer_(observer) {}
 
 TimeDomain::~TimeDomain() {}
 
@@ -72,13 +72,19 @@ void TimeDomain::ScheduleDelayedWork(internal::TaskQueueImpl* queue,
     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(