Update from https://crrev.com/314320

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>
 
@@ skipping 42 matching lines @@
   void RunUntilIdle();
 
   // Returns the current virtual time.
   TimeTicks GetCurrentMockTime() const;
 
   // Returns a TickClock that uses the mock time of |this| as its time source.
   // The returned TickClock will hold a reference to |this|.
   scoped_ptr<TickClock> GetMockTickClock() const;
 
   bool HasPendingTask() const;
+  size_t GetPendingTaskCount() 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,
@@ skipping 40 matching lines @@
   // |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_