Load CMA backend from shared library

chromecast/media/cma/backend/media_pipeline_device_factory_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_PIPELINE_DEVICE_FACTORY_DEFAULT_H_
-#define CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_DEVICE_FACTORY_DEFAULT_H_
-
-#include "chromecast/media/cma/backend/media_pipeline_device_factory.h"
-
-namespace chromecast {
-namespace media {
-
-// Factory that instantiates default (stub) media pipeline device elements.
-class MediaPipelineDeviceFactoryDefault : public MediaPipelineDeviceFactory {
- public:
-  MediaPipelineDeviceFactoryDefault();
-  ~MediaPipelineDeviceFactoryDefault() override {}
-
-  // MediaPipelineDeviceFactory implementation
-  scoped_ptr<MediaClockDevice> CreateMediaClockDevice() override;
-  scoped_ptr<AudioPipelineDevice> CreateAudioPipelineDevice() override;
-  scoped_ptr<VideoPipelineDevice> CreateVideoPipelineDevice() override;
-
- private:
-  // Owned by MediaPipelineDevice, but we hold raw pointer in order to wire up
-  // to audio and video devices.  MediaPipelineDevice guarantees the clock will
-  // outlive the audio and video devices.
-  MediaClockDevice* clock_;
-
-  DISALLOW_COPY_AND_ASSIGN(MediaPipelineDeviceFactoryDefault);
-};
-
-}  // namespace media
-}  // namespace chromecast
-
-#endif  // CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_DEVICE_FACTORY_DEFAULT_H_