scheduler: Throttle timers in out-of-view frames

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 25a18518660c6425e9f01077f547380fe8832e5b..20bf2b85f040d82179402d814beb8c55ce4e2ea3 100644
--- a/components/scheduler/renderer/web_frame_scheduler_impl.h
+++ b/components/scheduler/renderer/web_frame_scheduler_impl.h
@@ -33,13 +33,15 @@ class SCHEDULER_EXPORT WebFrameSchedulerImpl : public blink::WebFrameScheduler {
  public:
   WebFrameSchedulerImpl(RendererSchedulerImpl* renderer_scheduler,
                         WebViewSchedulerImpl* parent_web_view_scheduler,
-                        base::trace_event::BlameContext* blame_context);
+                        base::trace_event::BlameContext* blame_context,
+                        bool allow_hidden_timer_throttling);
 
   ~WebFrameSchedulerImpl() override;
 
   // blink::WebFrameScheduler implementation:
   void setFrameVisible(bool frame_visible) override;
   void setPageVisible(bool page_visible) override;
+  void setCrossOrigin(bool cross_origin) override;
   blink::WebTaskRunner* loadingTaskRunner() override;
   blink::WebTaskRunner* timerTaskRunner() override;
 
@@ -49,7 +51,8 @@ class SCHEDULER_EXPORT WebFrameSchedulerImpl : public blink::WebFrameScheduler {
   friend class WebViewSchedulerImpl;
 
   void DetachFromWebViewScheduler();
-  void ApplyPolicyToTimerQueue();
+  bool ShouldThrottleTimers() const;
+  void UpdateTimerThrottling(bool was_throttled);
 
   scoped_refptr<TaskQueue> loading_task_queue_;
   scoped_refptr<TaskQueue> timer_task_queue_;
@@ -61,6 +64,8 @@ class SCHEDULER_EXPORT WebFrameSchedulerImpl : public blink::WebFrameScheduler {
   TaskQueue::PumpPolicy virtual_time_pump_policy_;
   bool frame_visible_;

[alex clarke (OOO till 29th), 2016/06/28 17:11:28]

I can't help thinking this state would be useful to have in tracing somehow. 
Would you mind putting in a todo?

[Sami, 2016/06/28 17:22:45]

Yes, I thought about that too. Let's figure out a way to do it in a follow-up.

   bool page_visible_;
+  bool cross_origin_;
+  bool allow_hidden_timer_throttling_;

[alex clarke (OOO till 29th), 2016/06/28 17:11:28]

const

[Sami, 2016/06/28 17:22:45]

Done.

 
   DISALLOW_COPY_AND_ASSIGN(WebFrameSchedulerImpl);
 };