Fixed video muting test on Android, added logging.

content/test/data/media/webrtc_test_audio.js

Index: content/test/data/media/webrtc_test_audio.js
diff --git a/content/test/data/media/webrtc_test_audio.js b/content/test/data/media/webrtc_test_audio.js
index c9910be7d8d6ab1a0968e32e615902d585da7d53..68312ed3e72d743d100b17cc1628949fbce31c3e 100644
--- a/content/test/data/media/webrtc_test_audio.js
+++ b/content/test/data/media/webrtc_test_audio.js
@@ -8,11 +8,13 @@
 // calls back |callback| with an array with numbers in the [0, 32768] range.
 function gatherAudioLevelSamples(peerConnection, numSamples, frequency,
                                  callback) {
+  console.log('Gathering ' + numSamples + ' audio samples...');
   var audioLevelSamples = []
   var gatherSamples = setInterval(function() {
     peerConnection.getStats(function(response) {
       audioLevelSamples.push(getAudioLevelFromStats_(response));
       if (audioLevelSamples.length == numSamples) {
+        console.log('Gathered all samples.');
         clearInterval(gatherSamples);
         callback(audioLevelSamples);
       }
@@ -42,7 +44,7 @@ function verifyAudioIsPlaying(samples) {
           'to be 4000 < avg < 8000.'
   if (largest < 25000)
     throw 'Too low max audio level: got ' + largest + ', expected > 30000.';
-};
+}
 
 // If silent (like when muted), we should get very near zero audio level.
 function verifyIsSilent(samples) {
@@ -71,4 +73,4 @@ function getAudioLevelFromStats_(response) {
   expectEquals(1, audioOutputLevels.length);
 
   return audioOutputLevels[0];
-}
+}