Add ResumeRenderer to RendererScheduler for Purge+Suspend.

third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h

Index: third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
index a5eedc8e3b5ae95947f8f67746237b2a531806e5..66cdc886167e622381ad39b1fad9a09e65dfa85c 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
@@ -105,6 +105,7 @@ class BLINK_PLATFORM_EXPORT RendererSchedulerImpl
   void OnRendererBackgrounded() override;
   void OnRendererForegrounded() override;
   void SuspendRenderer() override;
+  void ResumeRenderer() override;
   void AddPendingNavigation(WebScheduler::NavigatingFrameType type) override;
   void RemovePendingNavigation(WebScheduler::NavigatingFrameType type) override;
   void OnNavigationStarted() override;
@@ -326,7 +327,7 @@ class BLINK_PLATFORM_EXPORT RendererSchedulerImpl
   // Helpers for safely suspending/resuming the timer queue after a
   // background/foreground signal.
   void SuspendTimerQueueWhenBackgrounded();
-  void ResumeTimerQueueWhenForegrounded();
+  void ResumeTimerQueueWhenForegroundedOrResumed();
 
   // The task cost estimators and the UserModel need to be reset upon page
   // nagigation. This function does that. Must be called from the main thread.