Propagate muted state from MediaStreamAudioSource into JS.

content/test/data/media/getusermedia.html

Index: content/test/data/media/getusermedia.html
diff --git a/content/test/data/media/getusermedia.html b/content/test/data/media/getusermedia.html
index 49b2beced94c9c58e83ad4489b6fce70fd80393b..e39912f06670b6380026a0016b87689c807435f7 100644
--- a/content/test/data/media/getusermedia.html
+++ b/content/test/data/media/getusermedia.html
@@ -63,6 +63,33 @@
         function(error) { sendValueToTest(error.name); });
   }
 
+  // Requests getusermedia and sets it up to test audio muting callbacks.
+  function getUserMediaForAudioMutingTest(initial_muted_state) {
+    console.log('Calling getUserMediaForAudioMutingTest.');
+    navigator.webkitGetUserMedia(
+        {audio: true},
+        function (stream) {
+          var track = stream.getAudioTracks()[0];
+          track.onmute = function(event) {
+            cancelTestTimeout();
+            sendValueToTest("onmute: muted="+ track.muted.toString() +
+                            ", readyState=" + track.readyState);
+          }
+          track.onunmute = function(event) {
+            cancelTestTimeout();
+            sendValueToTest("onunmute: muted="+ track.muted.toString() +
+                              ", readyState=" + track.readyState);
+          }
+          if (track.muted == initial_muted_state) {
+            reportTestSuccess();
+          } else {
+            failTest("Expected track.muted to be: " + initial_muted_state +
+                     ", was: " + track.muted);
+          }
+        },
+        failedCallback);
+  }
+
   function renderClonedMediastreamAndStop(constraints, waitTimeInSeconds) {
     console.log('Calling renderClonedMediastreamAndStop.');
     navigator.webkitGetUserMedia(