EME contentType checks for AC3/EAC3

media/base/eme_constants.h

Index: media/base/eme_constants.h
diff --git a/media/base/eme_constants.h b/media/base/eme_constants.h
index a3acdb94445399f3558bf85eeda0a2a243136447..7364e761ebf1ce65fb44230964d05636def3d63c 100644
--- a/media/base/eme_constants.h
+++ b/media/base/eme_constants.h
@@ -33,12 +33,20 @@ enum EmeCodec {
   EME_CODEC_MP4_HEVC = 1 << 7,
   EME_CODEC_MP4_DV_AVC = 1 << 8,
   EME_CODEC_MP4_DV_HEVC = 1 << 9,
+  EME_CODEC_MP4_AC3 = 1 << 10,
+  EME_CODEC_MP4_EAC3 = 1 << 11,
   EME_CODEC_WEBM_AUDIO_ALL = EME_CODEC_WEBM_OPUS | EME_CODEC_WEBM_VORBIS,
   EME_CODEC_WEBM_VIDEO_ALL =
       (EME_CODEC_WEBM_VP8 | EME_CODEC_WEBM_VP9 | EME_CODEC_COMMON_VP9),
   EME_CODEC_WEBM_ALL = (EME_CODEC_WEBM_AUDIO_ALL | EME_CODEC_WEBM_VIDEO_ALL),
 #if BUILDFLAG(USE_PROPRIETARY_CODECS)
-  EME_CODEC_MP4_AUDIO_ALL = EME_CODEC_MP4_AAC,
+  EME_CODEC_MP4_AUDIO_ALL = (EME_CODEC_MP4_AAC
+#if BUILDFLAG(ENABLE_AC3_EAC3_AUDIO_DEMUXING)
+                             |
+                             EME_CODEC_MP4_AC3 |
+                             EME_CODEC_MP4_EAC3
+#endif  // BUILDFLAG(ENABLE_AC3_EAC3_AUDIO_DEMUXING)
+                             ),
   EME_CODEC_MP4_VIDEO_ALL = (EME_CODEC_MP4_AVC1 | EME_CODEC_COMMON_VP9
 #if BUILDFLAG(ENABLE_HEVC_DEMUXING)
                              |