Load CMA backend from shared library

chromecast/media/cma/backend/media_clock_device_default.h

 // Copyright 2015 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 CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_CLOCK_DEVICE_DEFAULT_H_
 #define CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_CLOCK_DEVICE_DEFAULT_H_
 
 #include "base/macros.h"
-#include "chromecast/media/cma/backend/media_clock_device.h"
+#include "base/threading/thread_checker.h"
+#include "base/time/time.h"
+#include "chromecast/public/media/media_clock_device.h"
 
 namespace chromecast {
 namespace media {
 
 class MediaClockDeviceDefault : public MediaClockDevice {
  public:
   MediaClockDeviceDefault();
   ~MediaClockDeviceDefault() override;
 
   // MediaClockDevice implementation.
   State GetState() const override;
   bool SetState(State new_state) override;
-  bool ResetTimeline(base::TimeDelta time) override;
+  bool ResetTimeline(TimeDelta time) override;
   bool SetRate(float rate) override;
-  base::TimeDelta GetTime() override;
+  TimeDelta GetTime() override;
 
  private:
   State state_;
 
   // Media time sampled at STC time |stc_|.
-  base::TimeDelta media_time_;
+  TimeDelta media_time_;
   base::TimeTicks stc_;
 
   float rate_;
 
+  base::ThreadChecker thread_checker_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaClockDeviceDefault);
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_CLOCK_DEVICE_DEFAULT_H_