[content] Add support for Non nestable idle tasks the the RendererScheduler

content/renderer/scheduler/single_thread_idle_task_runner.h

Index: content/renderer/scheduler/single_thread_idle_task_runner.h
diff --git a/content/renderer/scheduler/single_thread_idle_task_runner.h b/content/renderer/scheduler/single_thread_idle_task_runner.h
index 8a8352853942212e0b600c1a1903c4478f241134..1a4b0c1b6e2869df06049376941c09569ce57a24 100644
--- a/content/renderer/scheduler/single_thread_idle_task_runner.h
+++ b/content/renderer/scheduler/single_thread_idle_task_runner.h
@@ -30,6 +30,10 @@ class SingleThreadIdleTaskRunner
   virtual void PostIdleTask(const tracked_objects::Location& from_here,
                             const IdleTask& idle_task);
 
+  virtual void PostNonNestableIdleTask(
+      const tracked_objects::Location& from_here,
+      const IdleTask& idle_task);
+
   virtual void PostIdleTaskAfterWakeup(
       const tracked_objects::Location& from_here,
       const IdleTask& idle_task);