Bug 831224: Added mochitest for variable-bitrate MP3s, r=padenot

The test checks the duration of an MP3 file with variable bitrate. The
MP3 file only contains silence. It uses a high bit-rate encoding for its
first half, a low bit-rate encoding for its second half. The correct
duration is 10 seconds, but an incorrect implementation will return a
much shorter value.

--HG--
extra : rebase_source : f62cf69a631a276c4e6e96e827ab615367cad877

content/media/test/manifest.js

@@ -42,6 +42,7 @@ var gPlayedTests = [
   { name:"seek.webm", type:"video/webm", duration:3.966 },
   { name:"gizmo.mp4", type:"video/mp4", duration:5.56 },
   { name:"owl.mp3", type:"audio/mpeg", duration:3.29 },
+  { name:"vbr.mp3", type:"audio/mpeg", duration:10.0 }
 ];
 
 // Used by test_mozLoadFrom.  Need one test file per decoder backend, plus