[Reland] Per WebViewScheduler virtual time

components/scheduler/renderer/renderer_scheduler.h

 // 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.
 
 #ifndef COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_
 #define COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_
 
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "components/scheduler/child/child_scheduler.h"
@@ skipping 133 matching lines @@
   virtual void SuspendTimerQueue() = 0;
 
   // Decrements the timer queue suspension count and re-enables the timer queue
   // if the suspension count is zero and the current schduler policy allows it.
   virtual void ResumeTimerQueue() = 0;
 
   // Sets whether to allow suspension of timers after the backgrounded signal is
   // received via OnRendererBackgrounded. Defaults to disabled.
   virtual void SetTimerQueueSuspensionWhenBackgroundedEnabled(bool enabled) = 0;
 
-  // Returns a double which is the number of seconds since epoch (Jan 1, 1970).
-  // This may represent either the real time, or a virtual time depending on
-  // whether or not the system is currently running a task associated with a
-  // virtual time domain or real time domain.
-  virtual double VirtualTimeSeconds() const = 0;
-
-  // Returns a microsecond resolution platform dependant time source.
-  // This may represent either the real time, or a virtual time depending on
-  // whether or not the system is currently running a task associated with a
-  // virtual time domain or real time domain.
-  virtual double MonotonicallyIncreasingVirtualTimeSeconds() const = 0;
-
  protected:
   RendererScheduler();
   DISALLOW_COPY_AND_ASSIGN(RendererScheduler);
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_RENDERER_RENDERER_SCHEDULER_H_