Move throttling of background timers into the renderer scheduler

components/scheduler/renderer/web_frame_scheduler_impl.h

Index: components/scheduler/renderer/web_frame_scheduler_impl.h
diff --git a/components/scheduler/renderer/web_frame_scheduler_impl.h b/components/scheduler/renderer/web_frame_scheduler_impl.h
index eb14bc0154a74b426c5e5c5f33032829e5c0ccdf..6d4c5b99c8764a1d671872ed9db42b85a0397602 100644
--- a/components/scheduler/renderer/web_frame_scheduler_impl.h
+++ b/components/scheduler/renderer/web_frame_scheduler_impl.h
@@ -36,10 +36,19 @@ class SCHEDULER_EXPORT WebFrameSchedulerImpl : public blink::WebFrameScheduler {
   blink::WebTaskRunner* timerTaskRunner() override;
   void setFrameOrigin(const blink::WebSecurityOrigin* origin) override;
 
+  void SetPageInBackground(bool page_in_background);
+
+  // Returns true if there was any remaining background work.
+  bool PumpBackgroundTasks();
+
+  // Returns true if there are any pending background tasks.
+  bool PendingBackgroundTasks();
+
  private:
   friend class WebViewSchedulerImpl;
 
   void DetachFromWebViewScheduler();
+  void ApplyPolicyToTimerQueue();
 
   scoped_refptr<TaskQueue> loading_task_queue_;
   scoped_refptr<TaskQueue> timer_task_queue_;
@@ -49,6 +58,7 @@ class SCHEDULER_EXPORT WebFrameSchedulerImpl : public blink::WebFrameScheduler {
   WebViewSchedulerImpl* parent_web_view_scheduler_;  // NOT OWNED
   blink::WebSecurityOrigin origin_;
   bool visible_;
+  bool page_in_background_;
 
   DISALLOW_COPY_AND_ASSIGN(WebFrameSchedulerImpl);
 };