[scheduler] Implement time-based cpu throttling.

third_party/WebKit/Source/platform/scheduler/renderer/throttled_time_domain.cc

 // Copyright 2016 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 "platform/scheduler/renderer/throttled_time_domain.h"
 
 namespace blink {
 namespace scheduler {
 
 ThrottledTimeDomain::ThrottledTimeDomain(TimeDomain::Observer* observer,
                                          const char* tracing_category)
     : RealTimeDomain(observer, tracing_category) {}
 
 ThrottledTimeDomain::~ThrottledTimeDomain() {}
 
 const char* ThrottledTimeDomain::GetName() const {
   return "ThrottledTimeDomain";
 }
 
 void ThrottledTimeDomain::RequestWakeup(base::TimeTicks now,
                                         base::TimeDelta delay) {
-  // We assume the owner (i.e. ThrottlingHelper) will manage wakeups on our
+  // We assume the owner (i.e. TaskQueueThrottler) will manage wakeups on our
   // behalf.
 }
 
 bool ThrottledTimeDomain::MaybeAdvanceTime() {
   base::TimeTicks next_run_time;
   if (!NextScheduledRunTime(&next_run_time))
     return false;
 
   base::TimeTicks now = Now();
   if (now >= next_run_time)
     return true;  // Causes DoWork to post a continuation.
 
   // Unlike RealTimeDomain::MaybeAdvanceTime we don't request a wake up here, we
-  // assume the owner (i.e. ThrottlingHelper) will manage wakeups on our behalf.
+  // assume the owner (i.e. TaskQueueThrottler) will manage wakeups on our
+  // behalf.
   return false;
 }
 
 }  // namespace scheduler
 }  // namespace blink