Bug 1315567: P4. Add mochitest. r=gerald

MozReview-Commit-ID: JtDJhQasdu7

--HG--
extra : rebase_source : 9ba6ac21ec06bc045311531c5f97e2040d322281

dom/media/test/test_can_play_type_mpeg.html

@@ -78,6 +78,16 @@ function check_mp4(v, enabled) {
   check("audio/x-m4a; codecs=mp4a.40.5", "probably");
   // HE-AAC v2
   check("audio/mp4; codecs=\"mp4a.40.29\"", "probably");
+
+  // Opus
+  check("audio/mp4; codecs=\"opus\"", "probably");
+  check("audio/mp4; codecs=opus", "probably");
+
+  // Flac.
+  // Not available on Android yet.
+  var expectedResult = IsSupportedAndroid() ? "" : "probably";
+  check("audio/mp4; codecs=\"flac\"", expectedResult);
+  check("audio/mp4; codecs=flac", expectedResult);
 }
 
 function check_mp3(v, enabled) {