Move throttling of background timers into the renderer scheduler

components/scheduler/renderer/web_view_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_VIEW_SCHEDULER_IMPL_H_
 #define COMPONENTS_SCHEDULER_RENDERER_WEB_VIEW_SCHEDULER_IMPL_H_
 
 #include <set>
 
 #include "base/macros.h"
+#include "components/scheduler/base/cancelable_closure_holder.h"
 #include "components/scheduler/scheduler_export.h"
 #include "third_party/WebKit/public/platform/WebViewScheduler.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }  // namespace base
 
 namespace blink {
 class WebView;
 }  // namespace blink
 
 namespace scheduler {
 
 class RendererSchedulerImpl;
 class WebFrameSchedulerImpl;
 
 class SCHEDULER_EXPORT WebViewSchedulerImpl : public blink::WebViewScheduler {
  public:
   WebViewSchedulerImpl(blink::WebView* web_view,
-                       RendererSchedulerImpl* renderer_scheduler);
+                       RendererSchedulerImpl* renderer_scheduler,
+                       const char* tracing_category);
 
   ~WebViewSchedulerImpl() override;
 
   // blink::WebViewScheduler implementation:
   void setPageInBackground(bool background) override;
   blink::WebPassOwnPtr<blink::WebFrameScheduler> createFrameScheduler()
       override;
 
   blink::WebView* web_view() const { return web_view_; }
 
+  static double DelayToNextRunTimeInSeconds(double now_in_seconds);
+
  private:
   friend class WebFrameSchedulerImpl;
 
   void Unregister(WebFrameSchedulerImpl* frame_scheduler);
+  void PumpThrottledTasks();
+  void SchedulePumpThrottledTasks();
 
   std::set<WebFrameSchedulerImpl*> frame_schedulers_;
   blink::WebView* web_view_;
   RendererSchedulerImpl* renderer_scheduler_;
+  CancelableClosureHolder pump_throttled_tasks_closure_;
+  const char* tracing_category_;  // NOT OWNED
   bool background_;

[Sami, 2015/11/17 10:12:21]

nit: could you rename this to page_in_background_ for consistency?

[alex clarke (OOO till 29th), 2015/11/23 17:13:45]

Done.

+  base::WeakPtrFactory<WebViewSchedulerImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebViewSchedulerImpl);
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_RENDERER_WEB_VIEW_SCHEDULER_IMPL_H_