Revert of Add TestMockTimeTaskRunner in base/test.

base/test/test_mock_time_task_runner.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 BASE_TEST_TEST_MOCK_TIME_TASK_RUNNER_H_
-#define BASE_TEST_TEST_MOCK_TIME_TASK_RUNNER_H_
-
-#include <queue>
-#include <vector>
-
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/single_thread_task_runner.h"
-#include "base/synchronization/lock.h"
-#include "base/test/test_pending_task.h"
-#include "base/threading/thread_checker.h"
-#include "base/time/tick_clock.h"
-#include "base/time/time.h"
-
-namespace base {
-
-// Runs pending tasks in the order of the tasks' post time + delay, and keeps
-// track of a mock (virtual) tick clock time that can be fast-forwarded.
-//
-// TestMockTimeTaskRunner has the following properties:
-//
-//   - Methods RunsTasksOnCurrentThread() and Post[Delayed]Task() can be called
-//     from any thread, but the rest of the methods must be called on the same
-//     thread the TaskRunner was created on.
-//   - It allows for reentrancy, in that it handles the running of tasks that in
-//     turn call back into it (e.g., to post more tasks).
-//   - Tasks are stored in a priority queue, and executed in the increasing
-//     order of post time + delay.
-//   - Non-nestable tasks are not supported.
-//   - Tasks aren't guaranteed to be destroyed immediately after they're run.
-//
-// This is a slightly more sophisticated version of TestSimpleTaskRunner, in
-// that it supports running delayed tasks in the correct temporal order.
-class TestMockTimeTaskRunner : public base::SingleThreadTaskRunner {
- public:
-  TestMockTimeTaskRunner();
-
-  // Fast-forwards virtual time by |delta|, causing all tasks with a remaining
-  // delay less than or equal to |delta| to be executed.
-  void FastForwardBy(base::TimeDelta delta);
-
-  // Fast-forwards virtual time just until all tasks are executed.
-  void FastForwardUntilNoTasksRemain();
-
-  // Executes all tasks that have no remaining delay. Tasks with a remaining
-  // delay greater than zero will remain enqueued, and no virtual time will
-  // elapse.
-  void RunUntilIdle();
-
-  // Returns the current virtual time.
-  TimeTicks GetCurrentMockTime() const;
-
-  // Returns a TickClock that uses the mock time of |this| as its time source.
-  scoped_ptr<TickClock> GetMockTickClock() const;
-
-  bool HasPendingTask() const;
-  TimeDelta NextPendingTaskDelay() const;
-
-  // SingleThreadTaskRunner:
-  bool RunsTasksOnCurrentThread() const override;
-  bool PostDelayedTask(const tracked_objects::Location& from_here,
-                               const base::Closure& task,
-                               TimeDelta delay) override;
-  bool PostNonNestableDelayedTask(
-      const tracked_objects::Location& from_here,
-      const base::Closure& task,
-      TimeDelta delay) override;
-
- protected:
-  ~TestMockTimeTaskRunner() override;
-
-  // Called before the next task to run is selected, so that subclasses have a
-  // last chance to make sure all tasks are posted.
-  virtual void OnBeforeSelectingTask();
-
-  // Called after the current mock time has been incremented so that subclasses
-  // can react to the passing of time.
-  virtual void OnAfterTimePassed();
-
-  // Called after each task is run so that subclasses may perform additional
-  // activities, e.g., pump additional task runners.
-  virtual void OnAfterTaskRun();
-
- private:
-  // Predicate that defines a strict weak temporal ordering of tasks.
-  class TemporalOrder {
-   public:
-    bool operator()(const TestPendingTask& first_task,
-                    const TestPendingTask& second_task) const;
-  };
-
-  typedef std::priority_queue<TestPendingTask,
-                              std::vector<TestPendingTask>,
-                              TemporalOrder> TaskPriorityQueue;
-
-  // Returns the |next_task| to run if there is any with a running time that is
-  // at most |reference| + |max_delta|. This additional complexity is required
-  // so that |max_delta| == TimeDelta::Max() can be supported.
-  bool DequeueNextTask(const base::TimeTicks& reference,
-                       const base::TimeDelta& max_delta,
-                       TestPendingTask* next_task);
-
-  base::ThreadChecker thread_checker_;
-  base::TimeTicks now_;
-
-  // Temporally ordered heap of pending tasks. Must only be accessed while the
-  // |tasks_lock_| is held.
-  TaskPriorityQueue tasks_;
-  base::Lock tasks_lock_;
-
-  DISALLOW_COPY_AND_ASSIGN(TestMockTimeTaskRunner);
-};
-
-}  // namespace base
-
-#endif  // BASE_TEST_TEST_MOCK_TIME_TASK_RUNNER_H_