[cherrypick] Fix computation of runtime for throttled tasks

components/scheduler/renderer/throttling_helper.h

 // 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.
 
 #ifndef COMPONENTS_SCHEDULER_RENDERER_THROTTLING_HELPER_H_
 #define COMPONENTS_SCHEDULER_RENDERER_THROTTLING_HELPER_H_
 
 #include <set>
 
 #include "base/macros.h"
 #include "components/scheduler/base/cancelable_closure_holder.h"
 #include "components/scheduler/base/time_domain.h"
 #include "components/scheduler/scheduler_export.h"
 #include "third_party/WebKit/public/platform/WebViewScheduler.h"
 
 namespace scheduler {
 
 class RendererSchedulerImpl;
-class VirtualTimeDomain;
+class ThrottledTimeDomain;
 class WebFrameSchedulerImpl;
 
 class SCHEDULER_EXPORT ThrottlingHelper : public TimeDomain::Observer {
  public:
   ThrottlingHelper(RendererSchedulerImpl* renderer_scheduler,
                    const char* tracing_category);
 
   ~ThrottlingHelper() override;
 
   // TimeDomain::Observer implementation:
   void OnTimeDomainHasImmediateWork() override;
   void OnTimeDomainHasDelayedWork() override;
 
   void Throttle(TaskQueue* task_queue);
   void Unthrottle(TaskQueue* task_queue);
 
-  const VirtualTimeDomain* time_domain() const { return time_domain_.get(); }
+  const ThrottledTimeDomain* time_domain() const { return time_domain_.get(); }
 
   static base::TimeTicks ThrottledRunTime(base::TimeTicks unthrottled_runtime);
 
   const scoped_refptr<TaskQueue>& task_runner() const { return task_runner_; }
 
  private:
   void PumpThrottledTasks();
   void MaybeSchedulePumpThrottledTasksLocked(
       const tracked_objects::Location& from_here,
       base::TimeTicks now,
       base::TimeTicks unthrottled_runtime);
 
   std::set<TaskQueue*> throttled_queues_;
   base::Closure forward_immediate_work_closure_;
   scoped_refptr<TaskQueue> task_runner_;
   RendererSchedulerImpl* renderer_scheduler_;  // NOT OWNED
   base::TickClock* tick_clock_;                // NOT OWNED
   const char* tracing_category_;               // NOT OWNED
-  scoped_ptr<VirtualTimeDomain> time_domain_;
+  scoped_ptr<ThrottledTimeDomain> time_domain_;
 
   CancelableClosureHolder suspend_timers_when_backgrounded_closure_;
   base::TimeTicks pending_pump_throttled_tasks_runtime_;
 
   base::WeakPtrFactory<ThrottlingHelper> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ThrottlingHelper);
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_RENDERER_THROTTLING_HELPER_H_