Rename SchedulerWorkerThread* to SchedulerWorker*

base/task_scheduler/scheduler_worker_thread.h

-// Copyright 2016 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 BASE_TASK_SCHEDULER_SCHEDULER_WORKER_THREAD_H_
-#define BASE_TASK_SCHEDULER_SCHEDULER_WORKER_THREAD_H_
-
-#include <memory>
-
-#include "base/base_export.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/synchronization/waitable_event.h"
-#include "base/task_scheduler/scheduler_lock.h"
-#include "base/task_scheduler/sequence.h"
-#include "base/threading/platform_thread.h"
-#include "base/time/time.h"
-
-namespace base {
-namespace internal {
-
-class TaskTracker;
-
-// A thread that runs Tasks from Sequences returned by a delegate.
-//
-// A SchedulerWorkerThread starts out sleeping. It is woken up by a call to
-// WakeUp(). After a wake-up, a SchedulerWorkerThread runs Tasks from Sequences
-// returned by the GetWork() method of its delegate as long as it doesn't return
-// nullptr. It also periodically checks with its TaskTracker whether shutdown
-// has completed and exits when it has.
-//
-// This class is thread-safe.
-class BASE_EXPORT SchedulerWorkerThread : public PlatformThread::Delegate {
- public:
-  // Delegate interface for SchedulerWorkerThread. The methods are always called
-  // from the thread managed by the SchedulerWorkerThread instance.
-  class Delegate {
-   public:
-    virtual ~Delegate() = default;
-
-    // Called by |worker_thread| when it enters its main function.
-    virtual void OnMainEntry(SchedulerWorkerThread* worker_thread) = 0;
-
-    // Called by |worker_thread| to get a Sequence from which to run a Task.
-    virtual scoped_refptr<Sequence> GetWork(
-        SchedulerWorkerThread* worker_thread) = 0;
-
-    // Called when |sequence| isn't empty after the SchedulerWorkerThread pops a
-    // Task from it. |sequence| is the last Sequence returned by GetWork().
-    virtual void ReEnqueueSequence(scoped_refptr<Sequence> sequence) = 0;
-
-    // Called by |worker_thread| to determine how long to sleep before the next
-    // call to GetWork(). GetWork() may be called before this timeout expires
-    // if the thread's WakeUp() method is called.
-    virtual TimeDelta GetSleepTimeout() = 0;
-  };
-
-  // Creates a SchedulerWorkerThread with priority |thread_priority| that runs
-  // Tasks from Sequences returned by |delegate|. |task_tracker| is used to
-  // handle shutdown behavior of Tasks. Returns nullptr if creating the
-  // underlying platform thread fails.
-  static std::unique_ptr<SchedulerWorkerThread> Create(
-      ThreadPriority thread_priority,
-      std::unique_ptr<Delegate> delegate,
-      TaskTracker* task_tracker);
-
-  // Destroying a SchedulerWorkerThread in production is not allowed; it is
-  // always leaked. In tests, it can only be destroyed after JoinForTesting()
-  // has returned.
-  ~SchedulerWorkerThread() override;
-
-  // Wakes up this SchedulerWorkerThread if it wasn't already awake. After this
-  // is called, this SchedulerWorkerThread will run Tasks from Sequences
-  // returned by the GetWork() method of its delegate until it returns nullptr.
-  void WakeUp();
-
-  SchedulerWorkerThread::Delegate* delegate() { return delegate_.get(); }
-
-  // Joins this SchedulerWorkerThread. If a Task is already running, it will be
-  // allowed to complete its execution. This can only be called once.
-  void JoinForTesting();
-
- private:
-  SchedulerWorkerThread(ThreadPriority thread_priority,
-                        std::unique_ptr<Delegate> delegate,
-                        TaskTracker* task_tracker);
-
-  // PlatformThread::Delegate:
-  void ThreadMain() override;
-
-  bool ShouldExitForTesting() const;
-
-  // Platform thread managed by this SchedulerWorkerThread.
-  PlatformThreadHandle thread_handle_;
-
-  // Event signaled to wake up this SchedulerWorkerThread.
-  WaitableEvent wake_up_event_;
-
-  const std::unique_ptr<Delegate> delegate_;
-  TaskTracker* const task_tracker_;
-
-  // Synchronizes access to |should_exit_for_testing_|.
-  mutable SchedulerLock should_exit_for_testing_lock_;
-
-  // True once JoinForTesting() has been called.
-  bool should_exit_for_testing_ = false;
-
-  DISALLOW_COPY_AND_ASSIGN(SchedulerWorkerThread);
-};
-
-}  // namespace internal
-}  // namespace base
-
-#endif  // BASE_TASK_SCHEDULER_SCHEDULER_WORKER_THREAD_H_