scheduler: Encapsulate task queue selector inside the scheduler helper

components/scheduler/child/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 COMPONENTS_SCHEDULER_CHILD_SCHEDULER_HELPER_H_
 #define COMPONENTS_SCHEDULER_CHILD_SCHEDULER_HELPER_H_
 
 #include "components/scheduler/child/cancelable_closure_holder.h"
+#include "components/scheduler/child/prioritizing_task_queue_selector.h"
 #include "components/scheduler/child/single_thread_idle_task_runner.h"
 #include "components/scheduler/child/task_queue_manager.h"
 #include "components/scheduler/child/time_source.h"
 #include "components/scheduler/scheduler_export.h"
 
 namespace scheduler {
 
-class PrioritizingTaskQueueSelector;
 class NestableSingleThreadTaskRunner;
 
 // Common scheduler functionality for Default and Idle tasks.
 class SCHEDULER_EXPORT SchedulerHelper {
  public:
   // Used to by scheduler implementations to customize idle behaviour.
   class SCHEDULER_EXPORT SchedulerHelperDelegate {
    public:
     SchedulerHelperDelegate();
     virtual ~SchedulerHelperDelegate();
@@ skipping 125 matching lines @@
   // Returns true if |state| represents being within an idle period state.
   static bool IsInIdlePeriod(IdlePeriodState state);
 
   void CheckOnValidThread() const {
     DCHECK(thread_checker_.CalledOnValidThread());
   }
 
   // Accessor methods.
   base::TimeTicks Now() const;
   IdlePeriodState SchedulerIdlePeriodState() const;
-  PrioritizingTaskQueueSelector* SchedulerTaskQueueSelector() 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;
+  void SetQueuePriority(size_t queue_index,
+                        PrioritizingTaskQueueSelector::QueuePriority priority);
+  void EnableQueue(size_t queue_index,
+                   PrioritizingTaskQueueSelector::QueuePriority priority);
+  void DisableQueue(size_t queue_index);
+  bool IsQueueEnabled(size_t queue_index) const;
 
   // Test helpers.
   void SetTimeSourceForTesting(scoped_ptr<TimeSource> time_source);
   void SetWorkBatchSizeForTesting(size_t work_batch_size);
   TaskQueueManager* GetTaskQueueManagerForTesting();
 
  private:
   friend class SchedulerHelperTest;
 
   bool ShouldWaitForQuiescence();
@@ skipping 29 matching lines @@
 
   base::WeakPtr<SchedulerHelper> weak_scheduler_ptr_;
   base::WeakPtrFactory<SchedulerHelper> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SchedulerHelper);
 };
 
 }  // namespace scheduler
 
 #endif  // COMPONENTS_SCHEDULER_CHILD_SCHEDULER_HELPER_H_