Refactoring AudioDirectiveHandler to support testing

components/copresence/handlers/audio/tick_clock_ref_counted.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_TICK_CLOCK_REF_COUNTED_H_
 #define COMPONENTS_COPRESENCE_HANDLERS_AUDIO_TICK_CLOCK_REF_COUNTED_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/time/time.h"
 
 namespace base {
 class TickClock;
+class TimeTicks;
 }
 
 namespace copresence {
 
 class TickClockRefCounted
     : public base::RefCountedThreadSafe<TickClockRefCounted> {
  public:
   explicit TickClockRefCounted(scoped_ptr<base::TickClock> clock);
-  base::TimeTicks NowTicks();
+
+  // Takes ownership of the clock.
+  explicit TickClockRefCounted(base::TickClock* clock);
+
+  base::TimeTicks NowTicks() const;
 
  private:
   friend class base::RefCountedThreadSafe<TickClockRefCounted>;
   virtual ~TickClockRefCounted();
 
   scoped_ptr<base::TickClock> clock_;
 
   DISALLOW_COPY_AND_ASSIGN(TickClockRefCounted);
 };
 
 }  // namespace copresence
 
 #endif  // COMPONENTS_COPRESENCE_HANDLERS_AUDIO_TICK_CLOCK_REF_COUNTED_H_