base: add MockTimer

base/timer/timer.h

Index: base/timer/timer.h
diff --git a/base/timer/timer.h b/base/timer/timer.h
index 71a7ae8888a3afd82be5419b24e4d0df22da2955..678fff120810db37ac0955b301895cbb6a0db80b 100644
--- a/base/timer/timer.h
+++ b/base/timer/timer.h
@@ -82,31 +82,33 @@ class BASE_EXPORT Timer {
   virtual ~Timer();
 
   // Returns true if the timer is running (i.e., not stopped).
-  bool IsRunning() const {
+  virtual bool IsRunning() const {

[Mark Mentovai, 2014/03/13 16:00:00]

The (public, even) accessor already exists here.

[Elly Fong-Jones, 2014/03/13 16:07:17]

Done.

     return is_running_;
   }
 
   // Returns the current delay for this timer.
-  TimeDelta GetCurrentDelay() const {
+  virtual TimeDelta GetCurrentDelay() const {
     return delay_;
   }
 
   // Start the timer to run at the given |delay| from now. If the timer is
   // already running, it will be replaced to call the given |user_task|.
-  void Start(const tracked_objects::Location& posted_from,
+  virtual void Start(const tracked_objects::Location& posted_from,
              TimeDelta delay,
              const base::Closure& user_task);
 
   // Call this method to stop and cancel the timer.  It is a no-op if the timer
   // is not running.
-  void Stop();
+  virtual void Stop();
 
   // Call this method to reset the timer delay. The user_task_ must be set. If
   // the timer is not running, this will start it by posting a task.
-  void Reset();
+  virtual void Reset();
 
   const base::Closure& user_task() const { return user_task_; }
   const TimeTicks& desired_run_time() const { return desired_run_time_; }
+  bool retain_user_task() const { return retain_user_task_; }

[Mark Mentovai, 2014/03/13 15:49:52]

If nobody has needed these outside of a Timer subclass yet, they probably won’t.
Can you move them into the protected section?

[Elly Fong-Jones, 2014/03/13 16:07:17]

Done.

+  bool is_repeating() const { return is_repeating_; }
 
  protected:
   // Used to initiate a new delayed task.  This has the side-effect of disabling
@@ -197,7 +199,7 @@ class BaseTimerMethodPointer : public Timer {
   // Start the timer to run at the given |delay| from now. If the timer is
   // already running, it will be replaced to call a task formed from
   // |reviewer->*method|.
-  void Start(const tracked_objects::Location& posted_from,
+  virtual void Start(const tracked_objects::Location& posted_from,
              TimeDelta delay,
              Receiver* receiver,
              ReceiverMethod method) {