Move throttling of background timers into the renderer scheduler

components/scheduler/renderer/web_view_scheduler_impl.h

Index: components/scheduler/renderer/web_view_scheduler_impl.h
diff --git a/components/scheduler/renderer/web_view_scheduler_impl.h b/components/scheduler/renderer/web_view_scheduler_impl.h
index 647d6d956bc31ea6c9feea1f6e626fad72909deb..303b8d21e82c466ff6213a07d2ab49f33f9b482f 100644
--- a/components/scheduler/renderer/web_view_scheduler_impl.h
+++ b/components/scheduler/renderer/web_view_scheduler_impl.h
@@ -8,6 +8,7 @@
 #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"
 
@@ -27,7 +28,8 @@ 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;
 
@@ -38,15 +40,22 @@ class SCHEDULER_EXPORT WebViewSchedulerImpl : public blink::WebViewScheduler {
 
   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);
 };