Add support for postNonNestableIdleTask to the Scheduler and use it in Oilpan

Source/platform/scheduler/Scheduler.cpp

Index: Source/platform/scheduler/Scheduler.cpp
diff --git a/Source/platform/scheduler/Scheduler.cpp b/Source/platform/scheduler/Scheduler.cpp
index 3e6193fe2aaa9c64e3d9c00c13523fa49c552cac..79895e6d7bb8f5594ed0998633a50f15deae08b0 100644
--- a/Source/platform/scheduler/Scheduler.cpp
+++ b/Source/platform/scheduler/Scheduler.cpp
@@ -70,6 +70,12 @@ void Scheduler::postIdleTask(const WebTraceLocation& location, PassOwnPtr<IdleTa
         m_webScheduler->postIdleTask(location, new IdleTaskRunner(idleTask));
 }
 
+void Scheduler::postNonNestableIdleTask(const WebTraceLocation& location, PassOwnPtr<IdleTask> idleTask)
+{
+    if (m_webScheduler)
+        m_webScheduler->postNonNestableIdleTask(location, new IdleTaskRunner(idleTask));
+}
+
 void Scheduler::postIdleTaskAfterWakeup(const WebTraceLocation& location, PassOwnPtr<IdleTask> idleTask)
 {
     if (m_webScheduler)