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

content/renderer/scheduler/single_thread_idle_task_runner.cc

Index: content/renderer/scheduler/single_thread_idle_task_runner.cc
diff --git a/content/renderer/scheduler/single_thread_idle_task_runner.cc b/content/renderer/scheduler/single_thread_idle_task_runner.cc
index cb3db7de530a1777b938bcaacaa7a9e046aadb43..9eb2db1263a10b8f521c629eca83260a436c4c50 100644
--- a/content/renderer/scheduler/single_thread_idle_task_runner.cc
+++ b/content/renderer/scheduler/single_thread_idle_task_runner.cc
@@ -37,6 +37,14 @@ void SingleThreadIdleTaskRunner::PostIdleTask(
       base::Bind(&SingleThreadIdleTaskRunner::RunTask, this, idle_task));
 }
 
+void SingleThreadIdleTaskRunner::PostNonNestableIdleTask(
+    const tracked_objects::Location& from_here,
+    const IdleTask& idle_task) {
+  idle_priority_task_runner_->PostNonNestableTask(
+      from_here,
+      base::Bind(&SingleThreadIdleTaskRunner::RunTask, this, idle_task));
+}
+
 void SingleThreadIdleTaskRunner::PostIdleTaskAfterWakeup(
     const tracked_objects::Location& from_here,
     const IdleTask& idle_task) {