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1 // Copyright 2018 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef BASE_TASK_SEQUENCE_MANAGER_TASK_TIME_OBSERVER_H_
6 #define BASE_TASK_SEQUENCE_MANAGER_TASK_TIME_OBSERVER_H_
7 
8 #include "base/time/time.h"
9 
10 namespace base {
11 namespace sequence_manager {
12 
13 // TaskTimeObserver provides an API for observing completion of tasks.
14 class TaskTimeObserver {
15  public:
16   TaskTimeObserver() = default;
17   virtual ~TaskTimeObserver() = default;
18 
19   // To be called when task is about to start.
20   virtual void WillProcessTask(TimeTicks start_time) = 0;
21 
22   // To be called when task is completed.
23   virtual void DidProcessTask(TimeTicks start_time, TimeTicks end_time) = 0;
24 
25  private:
26   DISALLOW_COPY_AND_ASSIGN(TaskTimeObserver);
27 };
28 
29 }  // namespace sequence_manager
30 }  // namespace base
31 
32 #endif  // BASE_TASK_SEQUENCE_MANAGER_TASK_TIME_OBSERVER_H_
33