Move throttling of background timers into the renderer scheduler

components/scheduler/base/virtual_time_domain.h

Index: components/scheduler/base/virtual_time_domain.h
diff --git a/components/scheduler/base/virtual_time_domain.h b/components/scheduler/base/virtual_time_domain.h
index ce1f99aac1b1896b5861718ff39ccb3697008c37..95aff4f36d009464ab89997b22ca1c6e1e4ed866 100644
--- a/components/scheduler/base/virtual_time_domain.h
+++ b/components/scheduler/base/virtual_time_domain.h
@@ -15,7 +15,8 @@ class TaskQueueManagerDelegate;
 
 class SCHEDULER_EXPORT VirtualTimeDomain : public TimeDomain {
  public:
-  VirtualTimeDomain(base::TimeTicks initial_time);
+  VirtualTimeDomain(TimeDomain::Observer* observer,
+                    base::TimeTicks initial_time);
 
   // TimeDomain implementation:
   LazyNow CreateLazyNow() override;