scheduler: Throttle timers in out-of-view frames

components/scheduler/renderer/web_frame_scheduler_impl.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_SCHEDULER_RENDERER_WEB_FRAME_SCHEDULER_IMPL_H_
 #define COMPONENTS_SCHEDULER_RENDERER_WEB_FRAME_SCHEDULER_IMPL_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 15 matching lines @@
 class AutoAdvancingVirtualTimeDomain;
 class RendererSchedulerImpl;
 class TaskQueue;
 class WebTaskRunnerImpl;
 class WebViewSchedulerImpl;
 
 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;
 
   void OnVirtualTimeDomainChanged();
 
  private:
   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_;
   std::unique_ptr<WebTaskRunnerImpl> loading_web_task_runner_;
   std::unique_ptr<WebTaskRunnerImpl> timer_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_;

[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);
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_RENDERER_WEB_FRAME_SCHEDULER_IMPL_H_