[Chromecast] Make ALSA rendering delay either accurate or kNoTimestamp

chromecast/media/cma/backend/alsa/alsa_wrapper.h

Index: chromecast/media/cma/backend/alsa/alsa_wrapper.h
diff --git a/chromecast/media/cma/backend/alsa/alsa_wrapper.h b/chromecast/media/cma/backend/alsa/alsa_wrapper.h
index 1e33a9b717e183c9b6ac4ef81b7d02137ca91ff0..04487866552f9495827fda380ce008fbce74e733 100644
--- a/chromecast/media/cma/backend/alsa/alsa_wrapper.h
+++ b/chromecast/media/cma/backend/alsa/alsa_wrapper.h
@@ -27,6 +27,7 @@ class AlsaWrapper : public ::media::AlsaWrapper {
   virtual snd_pcm_sframes_t PcmStatusGetDelay(const snd_pcm_status_t* obj);
   virtual void PcmStatusGetHtstamp(const snd_pcm_status_t* obj,
                                    snd_htimestamp_t* ptr);
+  virtual snd_pcm_state_t PcmStatusGetState(const snd_pcm_status_t* obj);
   virtual ssize_t PcmFormatSize(snd_pcm_format_t format, size_t samples);
   virtual int PcmHwParamsMalloc(snd_pcm_hw_params_t** ptr);
   virtual void PcmHwParamsFree(snd_pcm_hw_params_t* obj);