scheduler: Encapsulate TaskQueueManager inside SchedulerHelper

content/child/scheduler/scheduler_helper.h

 // Copyright 2015 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.
 
 #ifndef CONTENT_CHILD_SCHEDULER_SCHEDULER_HELPER_H_
 #define CONTENT_CHILD_SCHEDULER_SCHEDULER_HELPER_H_
 
 #include "cc/test/test_now_source.h"
 #include "content/child/scheduler/cancelable_closure_holder.h"
 #include "content/child/scheduler/single_thread_idle_task_runner.h"
@@ skipping 140 matching lines @@
   static bool IsInIdlePeriod(IdlePeriodState state);
 
   void CheckOnValidThread() const {
     DCHECK(thread_checker_.CalledOnValidThread());
   }
 
   // Accessor methods.
   base::TimeTicks Now() const;
   IdlePeriodState SchedulerIdlePeriodState() const;
   PrioritizingTaskQueueSelector* SchedulerTaskQueueSelector() const;
-  TaskQueueManager* SchedulerTaskQueueManager() const;
+  scoped_refptr<base::SingleThreadTaskRunner> TaskRunnerForQueue(
+      size_t queue_index) const;
+  void SetQueueName(size_t queue_index, const char* name);
+  bool IsQueueEmpty(size_t queue_index) const;
 
   // Test helpers.
   void SetTimeSourceForTesting(scoped_refptr<cc::TestNowSource> time_source);
   void SetWorkBatchSizeForTesting(size_t work_batch_size);
 
  private:
   friend class SchedulerHelperTest;
 
   bool ShouldWaitForQuiescence();
   void EnableLongIdlePeriodAfterWakeup();
@@ skipping 27 matching lines @@
 
   base::WeakPtr<SchedulerHelper> weak_scheduler_ptr_;
   base::WeakPtrFactory<SchedulerHelper> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SchedulerHelper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_SCHEDULER_SCHEDULER_HELPER_H_