Move throttling of background timers into the renderer scheduler

components/scheduler/renderer/renderer_scheduler_impl.cc

 // Copyright 2014 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/renderer/renderer_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/debug/stack_trace.h"
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 158 matching lines @@
 RendererSchedulerImpl::LoadingTaskRunner() {
   helper_.CheckOnValidThread();
   return default_loading_task_runner_;
 }
 
 scoped_refptr<TaskQueue> RendererSchedulerImpl::TimerTaskRunner() {
   helper_.CheckOnValidThread();
   return default_timer_task_runner_;
 }
 
+scoped_refptr<TaskQueue> RendererSchedulerImpl::ControlTaskRunner() {
+  return helper_.ControlTaskRunner();

[Sami, 2015/11/17 10:12:21]

nit: helper_.CheckOnValidThread();

[alex clarke (OOO till 29th), 2015/11/23 17:13:45]

Done.

+}
+
 scoped_refptr<TaskQueue> RendererSchedulerImpl::NewLoadingTaskRunner(
     const char* name) {
   helper_.CheckOnValidThread();
   scoped_refptr<TaskQueue> loading_task_queue(helper_.NewTaskQueue(
       TaskQueue::Spec(name).SetShouldMonitorQuiescence(true)));
   loading_task_runners_.insert(loading_task_queue);
   loading_task_queue->SetQueuePriority(
       MainThreadOnly().current_policy.loading_queue_priority);
   loading_task_queue->AddTaskObserver(
       &MainThreadOnly().loading_task_cost_estimator);
@@ skipping 851 matching lines @@
 double RendererSchedulerImpl::CurrentTimeSeconds() const {
   return helper_.scheduler_tqm_delegate()->CurrentTimeSeconds();
 }
 
 double RendererSchedulerImpl::MonotonicallyIncreasingTimeSeconds() const {
   return helper_.scheduler_tqm_delegate()->NowTicks().ToInternalValue() /
          static_cast<double>(base::Time::kMicrosecondsPerSecond);
 }
 
 }  // namespace scheduler