Convert Chromoting plugin logging to appear in client UI

remoting/client/appengine/static_files/chromoting_session.js

Index: remoting/client/appengine/static_files/chromoting_session.js
diff --git a/remoting/client/appengine/static_files/chromoting_session.js b/remoting/client/appengine/static_files/chromoting_session.js
index 7c2a8b9fd3da6e84f8527ef036a5b04cc500b46d..6a95f7dea191b904d29912430a5772c98280263b 100644
--- a/remoting/client/appengine/static_files/chromoting_session.js
+++ b/remoting/client/appengine/static_files/chromoting_session.js
@@ -19,6 +19,7 @@ chromoting.connectMethod = 'sandboxed';
 // to the plugin.
 function feedIq() {
   var xhr = new XMLHttpRequest();
+  addToDebugLog("xmpp proxy: " + chromoting.httpXmppProxy);
   xhr.open("GET", chromoting.httpXmppProxy + '/readIq?host_jid=' +
            encodeURIComponent(document.hostjid), true);
   xhr.withCredentials = true;
@@ -42,6 +43,7 @@ function feedIq() {
 
 function registerConnection() {
   var xhr = new XMLHttpRequest();
+  addToDebugLog("xmpp proxy: " + chromoting.httpXmppProxy);
   xhr.open("POST", chromoting.httpXmppProxy + '/newConnection', true);
   xhr.withCredentials = true;
   xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');