[Chromecast] Add new volume control API to CastMediaShlib

chromecast/media/cma/backend/audio_decoder_wrapper.h

-// Copyright 2016 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_AUDIO_DECODER_WRAPPER_H_
-#define CHROMECAST_MEDIA_CMA_BACKEND_AUDIO_DECODER_WRAPPER_H_
-
-#include "base/macros.h"
-#include "chromecast/public/media/media_pipeline_backend.h"
-
-namespace chromecast {
-namespace media {
-
-class AudioDecoderWrapper : public MediaPipelineBackend::AudioDecoder {
- public:
-  explicit AudioDecoderWrapper(
-      MediaPipelineBackend::AudioDecoder* audio_decoder);
-  ~AudioDecoderWrapper() override;
-
-  // MediaPipelineBackend::AudioDecoder implementation:
-  void SetDelegate(Delegate* delegate) override;
-  MediaPipelineBackend::BufferStatus PushBuffer(
-      CastDecoderBuffer* buffer) override;
-  void GetStatistics(Statistics* statistics) override;
-  bool SetConfig(const AudioConfig& config) override;
-  bool SetVolume(float multiplier) override;
-  RenderingDelay GetRenderingDelay() override;
-
-  bool SetStreamTypeVolume(float stream_type_volume);
-
- private:
-  MediaPipelineBackend::AudioDecoder* const audio_decoder_;
-  float stream_type_volume_;
-  float stream_volume_;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioDecoderWrapper);
-};
-
-}  // namespace media
-}  // namespace chromecast
-
-#endif  // CHROMECAST_MEDIA_CMA_BACKEND_AUDIO_DECODER_WRAPPER_H_