Move throttling of background timers into the renderer scheduler

components/scheduler/base/task_queue_impl.cc

Index: components/scheduler/base/task_queue_impl.cc
diff --git a/components/scheduler/base/task_queue_impl.cc b/components/scheduler/base/task_queue_impl.cc
index 0ad965b00f774201920becfde5d0fb3b24faf0ae..9f3e337665643220e866330413568c399dddffe9 100644
--- a/components/scheduler/base/task_queue_impl.cc
+++ b/components/scheduler/base/task_queue_impl.cc
@@ -107,18 +107,6 @@ bool TaskQueueImpl::PostNonNestableDelayedTask(
   return PostDelayedTaskImpl(from_here, task, delay, TaskType::NON_NESTABLE);
 }
 
-bool TaskQueueImpl::PostDelayedTaskAt(
-    const tracked_objects::Location& from_here,
-    const base::Closure& task,
-    base::TimeTicks desired_run_time) {
-  base::AutoLock lock(any_thread_lock_);
-  if (!any_thread().task_queue_manager)
-    return false;
-  LazyNow lazy_now(any_thread().time_domain->CreateLazyNow());
-  return PostDelayedTaskLocked(&lazy_now, from_here, task, desired_run_time,
-                               TaskType::NORMAL);
-}
-
 bool TaskQueueImpl::PostDelayedTaskImpl(
     const tracked_objects::Location& from_here,
     const base::Closure& task,
@@ -226,6 +214,11 @@ TaskQueue::QueueState TaskQueueImpl::GetQueueState() const {
   }
 }
 
+bool TaskQueueImpl::HasPendingDelayedTask() const {
+  base::AutoLock lock(any_thread_lock_);
+  return !any_thread().delayed_task_queue.empty();
+}
+
 bool TaskQueueImpl::TaskIsOlderThanQueuedTasks(const Task* task) {
   // A null task is passed when UpdateQueue is called before any task is run.
   // In this case we don't want to pump an after_wakeup queue, so return true