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

content/renderer/scheduler/renderer_scheduler_impl.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/scheduler/renderer_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/output/begin_frame_args.h"
 #include "content/renderer/scheduler/renderer_task_queue_selector.h"
 #include "ui/gfx/frame_time.h"
 
 namespace content {
 
 RendererSchedulerImpl::RendererSchedulerImpl(
-    scoped_refptr<base::SingleThreadTaskRunner> main_task_runner)
+    scoped_refptr<NestableSingleThreadTaskRunner> main_task_runner)
     : renderer_task_queue_selector_(new RendererTaskQueueSelector()),
       task_queue_manager_(
           new TaskQueueManager(TASK_QUEUE_COUNT,
                                main_task_runner,
                                renderer_task_queue_selector_.get())),
       control_task_runner_(
           task_queue_manager_->TaskRunnerForQueue(CONTROL_TASK_QUEUE)),
       control_task_after_wakeup_runner_(task_queue_manager_->TaskRunnerForQueue(
           CONTROL_TASK_AFTER_WAKEUP_QUEUE)),
       default_task_runner_(
@@ skipping 526 matching lines @@
 }
 
 void RendererSchedulerImpl::RemoveTaskObserver(
     base::MessageLoop::TaskObserver* task_observer) {
   DCHECK(main_thread_checker_.CalledOnValidThread());
   if (task_queue_manager_)
     task_queue_manager_->RemoveTaskObserver(task_observer);
 }
 
 }  // namespace content