Load CMA backend from shared library

chromecast/media/cma/backend/media_pipeline_device_factory.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_H_
-#define CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_DEVICE_FACTORY_H_
-
-#include "base/memory/scoped_ptr.h"
-
-namespace chromecast {
-namespace media {
-
-class AudioPipelineDevice;
-class MediaClockDevice;
-class MediaPipelineDeviceParams;
-class VideoPipelineDevice;
-
-// Factory for creating platform-specific clock, audio and video devices.
-// A new factory will be instantiated for each media player instance.
-class MediaPipelineDeviceFactory {
- public:
-  MediaPipelineDeviceFactory() {}
-  virtual ~MediaPipelineDeviceFactory() {}
-
-  virtual scoped_ptr<MediaClockDevice> CreateMediaClockDevice() = 0;
-  virtual scoped_ptr<AudioPipelineDevice> CreateAudioPipelineDevice() = 0;
-  virtual scoped_ptr<VideoPipelineDevice> CreateVideoPipelineDevice() = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(MediaPipelineDeviceFactory);
-};
-
-// Creates the platform-specific pipeline device factory.
-// TODO(halliwell): move into libcast_media
-scoped_ptr<MediaPipelineDeviceFactory> GetMediaPipelineDeviceFactory(
-    const MediaPipelineDeviceParams& params);
-
-}  // namespace media
-}  // namespace chromecast
-
-#endif  // CHROMECAST_MEDIA_CMA_BACKEND_MEDIA_PIPELINE_DEVICE_FACTORY_H_