Mojo interfaces needed for switching audio rendering stream creation and closing from IPC to Mojo

media/audio/audio_parameters.h

Index: media/audio/audio_parameters.h
diff --git a/media/audio/audio_parameters.h b/media/audio/audio_parameters.h
index d7d730b91497b1a6bd145961c5ce7b6e0ec6f2c1..3842c5a0f95d4f2544c22c4ae4d29185985e2591 100644
--- a/media/audio/audio_parameters.h
+++ b/media/audio/audio_parameters.h
@@ -151,6 +151,7 @@ class MEDIA_EXPORT AudioParameters {
            channels == ChannelLayoutToChannelCount(channel_layout_));
     channels_ = channels;
   }
+  void set_channels(int channels) { channels_ = channels; }

[DaleCurtis, 2016/04/29 17:48:04]

Don't add this, instead add a set_channel_layout() and only use
set_channels_for_discrete().

[rchtara, 2016/05/02 15:54:10]

I replaced set_channels by set_channels_for_discrete and removed set_channels.

However, for the set_channel_layout(),  we don't have to add it as we can just
set channel_layout in the constructor.
Done.

   int channels() const { return channels_; }
 
   void set_sample_rate(int sample_rate) { sample_rate_ = sample_rate; }