Guard against midstream audio configuration changes.

webkit/media/crypto/ppapi/ffmpeg_cdm_audio_decoder.h

Index: webkit/media/crypto/ppapi/ffmpeg_cdm_audio_decoder.h
diff --git a/webkit/media/crypto/ppapi/ffmpeg_cdm_audio_decoder.h b/webkit/media/crypto/ppapi/ffmpeg_cdm_audio_decoder.h
index d10ce4ce11682e6445ffe5a40630a073cef5df81..56be2297f91f7ad84ffee58ccac91cb052aebf47 100644
--- a/webkit/media/crypto/ppapi/ffmpeg_cdm_audio_decoder.h
+++ b/webkit/media/crypto/ppapi/ffmpeg_cdm_audio_decoder.h
@@ -69,6 +69,10 @@ class FFmpegCdmAudioDecoder {
   // Audio format.
   int bits_per_channel_;
   int samples_per_second_;
+  int channels_;
+
+  // AVSampleFormat initially requested; not Chrome's SampleFormat.
+  int av_sample_format_;
 
   // Used for computing output timestamps.
   scoped_ptr<media::AudioTimestampHelper> output_timestamp_helper_;