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..c833a6ae1aca1fae48ec49704836f70fa49021d5 100644
--- a/components/scheduler/renderer/web_frame_scheduler_impl.h
+++ b/components/scheduler/renderer/web_frame_scheduler_impl.h
@@ -33,15 +33,18 @@ 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;
+  blink::WebTaskRunner* defaultTaskRunner() override;
 
   void OnVirtualTimeDomainChanged();
 
@@ -49,18 +52,23 @@ 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_;
+  scoped_refptr<TaskQueue> default_task_queue_;
   std::unique_ptr<WebTaskRunnerImpl> loading_web_task_runner_;
   std::unique_ptr<WebTaskRunnerImpl> timer_web_task_runner_;
+  std::unique_ptr<WebTaskRunnerImpl> default_web_task_runner_;
   RendererSchedulerImpl* renderer_scheduler_;            // NOT OWNED
   WebViewSchedulerImpl* parent_web_view_scheduler_;      // NOT OWNED
   base::trace_event::BlameContext* blame_context_;       // NOT OWNED
   TaskQueue::PumpPolicy virtual_time_pump_policy_;
   bool frame_visible_;
   bool page_visible_;
+  bool cross_origin_;
+  const bool allow_hidden_timer_throttling_;

[esprehn, 2016/06/29 05:06:48]

I'm sad we keep plumbing more and more stuff out of blink. The scheduler is
moving in the exact opposite direction of everyone else and the Onion Soup plan.
We really really need to stop doing this and get the scheduler code moved into
blink. This is all technical debt.

 
   DISALLOW_COPY_AND_ASSIGN(WebFrameSchedulerImpl);
 };