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1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef COMPONENTS_SCHEDULER_BASE_LAZY_NOW_H_ | 5 #ifndef COMPONENTS_SCHEDULER_BASE_LAZY_NOW_H_ |
6 #define COMPONENTS_SCHEDULER_BASE_LAZY_NOW_H_ | 6 #define COMPONENTS_SCHEDULER_BASE_LAZY_NOW_H_ |
7 | 7 |
8 #include "base/time/time.h" | 8 #include "base/time/time.h" |
9 | 9 |
| 10 namespace base { |
| 11 class TickClock; |
| 12 } |
| 13 |
10 namespace scheduler { | 14 namespace scheduler { |
11 class TaskQueueManager; | |
12 | |
13 namespace internal { | 15 namespace internal { |
14 | 16 |
15 // Now() is somewhat expensive so it makes sense not to call Now() unless we | 17 // Now() is somewhat expensive so it makes sense not to call Now() unless we |
16 // really need to. | 18 // really need to. |
17 class LazyNow { | 19 class LazyNow { |
18 public: | 20 public: |
19 explicit LazyNow(base::TimeTicks now) | 21 explicit LazyNow(base::TimeTicks now) : tick_clock_(nullptr), now_(now) { |
20 : task_queue_manager_(nullptr), now_(now) { | |
21 DCHECK(!now.is_null()); | 22 DCHECK(!now.is_null()); |
22 } | 23 } |
23 | 24 |
24 explicit LazyNow(TaskQueueManager* task_queue_manager) | 25 explicit LazyNow(base::TickClock* tick_clock) : tick_clock_(tick_clock) {} |
25 : task_queue_manager_(task_queue_manager) {} | |
26 | 26 |
27 base::TimeTicks Now(); | 27 base::TimeTicks Now(); |
28 | 28 |
29 private: | 29 private: |
30 TaskQueueManager* task_queue_manager_; // NOT OWNED | 30 base::TickClock* tick_clock_; // NOT OWNED |
31 base::TimeTicks now_; | 31 base::TimeTicks now_; |
32 }; | 32 }; |
33 | 33 |
34 } // namespace internal | 34 } // namespace internal |
35 } // namespace scheduler | 35 } // namespace scheduler |
36 | 36 |
37 #endif // COMPONENTS_SCHEDULER_BASE_LAZY_NOW_H_ | 37 #endif // COMPONENTS_SCHEDULER_BASE_LAZY_NOW_H_ |
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