[Reland] Per WebViewScheduler virtual time

components/scheduler/renderer/webthread_impl_for_renderer_scheduler.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_WEBTHREAD_IMPL_FOR_RENDERER_SCHEDULER_H_
 #define COMPONENTS_SCHEDULER_RENDERER_WEBTHREAD_IMPL_FOR_RENDERER_SCHEDULER_H_
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "components/scheduler/child/webthread_base.h"
 
 namespace blink {
 class WebScheduler;
 };
 
 namespace scheduler {
 class RendererSchedulerImpl;
 class WebSchedulerImpl;
 class WebTaskRunnerImpl;
 
 class SCHEDULER_EXPORT WebThreadImplForRendererScheduler
     : public WebThreadBase {
  public:
   explicit WebThreadImplForRendererScheduler(RendererSchedulerImpl* scheduler);
   ~WebThreadImplForRendererScheduler() override;
 
   // blink::WebThread implementation.
   blink::WebScheduler* scheduler() const override;
   blink::PlatformThreadId threadId() const override;
   blink::WebTaskRunner* taskRunner() override;
+  double virtualTimeSeconds() override;
+  double monotonicallyIncreasingVirtualTimeSeconds() override;
 
   // WebThreadBase implementation.
   base::SingleThreadTaskRunner* TaskRunner() const override;
   SingleThreadIdleTaskRunner* IdleTaskRunner() const override;
 
  private:
   void AddTaskObserverInternal(
       base::MessageLoop::TaskObserver* observer) override;
   void RemoveTaskObserverInternal(
       base::MessageLoop::TaskObserver* observer) override;
 
   scoped_ptr<WebSchedulerImpl> web_scheduler_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner_;
   RendererSchedulerImpl* scheduler_;  // Not owned.
   blink::PlatformThreadId thread_id_;
   scoped_ptr<WebTaskRunnerImpl> web_task_runner_;
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_RENDERER_WEBTHREAD_IMPL_FOR_RENDERER_SCHEDULER_H_