Adding an ALAC enum to AudioDecoderConfig

media/base/audio_decoder_config.h

Index: media/base/audio_decoder_config.h
diff --git a/media/base/audio_decoder_config.h b/media/base/audio_decoder_config.h
index 199da849606494ebcb1ec9ac37a96836ad4aed7f..9b2fe96855dba536bc7564cd993f57fdcb970cb4 100644
--- a/media/base/audio_decoder_config.h
+++ b/media/base/audio_decoder_config.h
@@ -36,13 +36,14 @@ enum AudioCodec {
   kCodecOpus = 12,
   // kCodecEAC3 = 13,
   kCodecPCM_ALAW = 14,
+  kCodecALAC = 15,
   // DO NOT ADD RANDOM AUDIO CODECS!
   //
   // The only acceptable time to add a new codec is if there is production code
   // that uses said codec in the same CL.
 
   // Must always be equal to the largest entry ever logged.
-  kAudioCodecMax = kCodecPCM_ALAW,
+  kAudioCodecMax = kCodecALAC,
 };
 
 // TODO(dalecurtis): FFmpeg API uses |bytes_per_channel| instead of