Use passthrough decoder for (E)AC3 formats

media/base/mime_util_internal.cc

Index: media/base/mime_util_internal.cc
diff --git a/media/base/mime_util_internal.cc b/media/base/mime_util_internal.cc
index 031d548c7ced5e5e9b85f3f1d36481a2d751d4e7..6de9609860b504ca7b821d61711d2950b377d19c 100644
--- a/media/base/mime_util_internal.cc
+++ b/media/base/mime_util_internal.cc
@@ -479,8 +479,6 @@ bool MimeUtil::IsCodecSupportedOnPlatform(
     // The following codecs are never supported.
     // ----------------------------------------------------------------------
     case INVALID_CODEC:
-    case AC3:
-    case EAC3:
     case THEORA:
       return false;
 
@@ -582,6 +580,14 @@ bool MimeUtil::IsCodecSupportedOnPlatform(
       // MediaPlayer only supports VP9 in WebM.
       return mime_type_lower_case == "video/webm";
     }
+
+    case AC3:
+    case EAC3:
+#if BUILDFLAG(ENABLE_AC3_EAC3_AUDIO_DEMUXING)
+      return true;
+#else
+      return false;
+#endif
   }
 
   return false;