Add error handler for license request.

media/test/data/eme_player_js/utils.js

Index: media/test/data/eme_player_js/utils.js
diff --git a/media/test/data/eme_player_js/utils.js b/media/test/data/eme_player_js/utils.js
index ca62cd1f7b2a1ff9662c123849eabe1975028eb9..22e8bc5b663928295326727c0fa0f6269b61b257 100644
--- a/media/test/data/eme_player_js/utils.js
+++ b/media/test/data/eme_player_js/utils.js
@@ -226,7 +226,9 @@ Utils.sendRequest = function(requestType, responseType, message, serverURL,
     var xmlhttp = new XMLHttpRequest();
     xmlhttp.responseType = responseType;
     xmlhttp.open(requestType, serverURL, true);
-
+    xmlhttp.onerror = function(e) {
+      Utils.failTest('FAILED: Unable to request license.');

[ddorwin, 2014/09/30 20:43:44]

How about:
'FAILED: License request XHR failed.'

That's more meaningful to the reader.

Is there something in |e|, even in some cases, that we can print to provide more
context?
Also, we could print the serverURL and maybe other values.

[sandersd (OOO until July 31), 2014/09/30 20:56:35]

Done.

The server URL is logged at the start of the attempt.

All the other values are empty, but I've added logging of statusText anyway.

+    };
     xmlhttp.onload = function(e) {
       if (this.status == 200) {
         if (onSuccessCallbackFn)