Set audio format before adding pepper sink to audio track.

content/renderer/pepper/pepper_media_stream_audio_track_host.h

Index: content/renderer/pepper/pepper_media_stream_audio_track_host.h
diff --git a/content/renderer/pepper/pepper_media_stream_audio_track_host.h b/content/renderer/pepper/pepper_media_stream_audio_track_host.h
index 4ed3e215ddffb6a4359020ceff26041c382baeaa..fd2fc544429dc3eb742c2778c3e16d1d661b8291 100644
--- a/content/renderer/pepper/pepper_media_stream_audio_track_host.h
+++ b/content/renderer/pepper/pepper_media_stream_audio_track_host.h
@@ -53,6 +53,9 @@ class PepperMediaStreamAudioTrackHost : public PepperMediaStreamTrackHostBase {
     void SendConfigureReply(int32_t result);
 
    private:
+    // To allow |DidConnectPendingHostToResource()| to call |OnSetFormat()|.
+    friend class PepperMediaStreamAudioTrackHost;

[dmichael (off chromium), 2015/01/20 17:07:03]

I think I'd rather you either:
1) Make OnSetFormat public (OnData can be as well)
or
2) At the place you need to call OnSetFormat,
static_cast<MediaStreamAudioSink*>(host_)

Either option would better preserve encapsulation of AudioSink.

[Anand Mistry (off Chromium), 2015/01/27 02:12:10]

Done #1.

+
     // Initializes buffers on the main thread.
     void SetFormatOnMainThread(int bytes_per_second, int bytes_per_frame);