Revert of Per WebViewScheduler virtual time

components/scheduler/renderer/renderer_scheduler.h

Index: components/scheduler/renderer/renderer_scheduler.h
diff --git a/components/scheduler/renderer/renderer_scheduler.h b/components/scheduler/renderer/renderer_scheduler.h
index 98635ba6be4efc692a9f5239c6d485204eff9608..9f9204f111cb8b4dc33d8ea73162fb8488ce4991 100644
--- a/components/scheduler/renderer/renderer_scheduler.h
+++ b/components/scheduler/renderer/renderer_scheduler.h
@@ -151,6 +151,18 @@
   // 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);