Change base::TickClock to a ref counted class.

components/copresence/handlers/audio/audio_directive_handler.h

 // Copyright 2014 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 COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_HANDLER_H_
 #define COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_HANDLER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 43 matching lines @@
 
   // Returns the currently playing token.
   const std::string& PlayingToken(AudioType type) const {
     return audio_manager_->get_token(type);
   }
 
   void set_audio_manager_for_testing(scoped_ptr<AudioManager> manager) {
     audio_manager_ = manager.Pass();
   }
 
+  void set_clock_for_testing(const scoped_refptr<base::TickClock>& clock);
+  void set_timer_for_testing(scoped_ptr<base::Timer> timer);
+
  private:
   friend class AudioDirectiveHandlerTest;
 
   // Processes the next active instruction, updating our audio manager state
   // accordingly.
   void ProcessNextInstruction();
 
   bool GetNextInstructionExpiry(base::TimeTicks* next_event);
 
   scoped_ptr<AudioManager> audio_manager_;
 
   // Audible and inaudible lists.
   // AUDIBLE = 0, INAUDIBLE = 1 (see copresence_constants.h).
   AudioDirectiveList transmits_list_[2];
   AudioDirectiveList receives_list_[2];
 
   scoped_ptr<base::Timer> audio_event_timer_;
 
-  scoped_ptr<base::TickClock> clock_;
+  scoped_refptr<base::TickClock> clock_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioDirectiveHandler);
 };
 
 }  // namespace copresence
 
 #endif  // COMPONENTS_COPRESENCE_HANDLERS_AUDIO_AUDIO_DIRECTIVE_HANDLER_H_