Add basic debug log to host page.

remoting/webapp/me2mom/remoting.js

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // TODO(jamiewalch): strict mode causes the page to crash so it's disabled for
 // now. Reinstate this when the associated bug is fixed.
 // http://code.google.com/p/v8/issues/detail?id=1423
 //"use strict";
 
 // TODO(ajwong): This seems like a bad idea to share the exact same object
@@ skipping 139 matching lines @@
 }
 
 function setGlobalModePersistent(mode) {
   setGlobalMode(mode);
   remoting.setItem('startup-mode', mode);
 }
 
 function setHostMode(mode) {
   var section = document.getElementById('host-section');
   var modes = section.getElementsByClassName('mode');
+  addToDebugLog('Host mode: ' + mode);
   setMode_(mode, modes);
 }
 
 function setClientMode(mode) {
   var section = document.getElementById('client-section');
   var modes = section.getElementsByClassName('mode');
+  addToDebugLog('Client mode: ' + mode);
   setMode_(mode, modes);
 }
 
 function tryShare() {
+  addToDebugLog("Attempting to share...");
   if (remoting.oauth2.needsNewAccessToken()) {
+    addToDebugLog("Refreshing token...");
     remoting.oauth2.refreshAccessToken(function() {
       if (remoting.oauth2.needsNewAccessToken()) {
         // If we still need it, we're going to infinite loop.
+        addToDebugLog("Unable to get access token");
         throw "Unable to get access token";
       }
       tryShare();
     });
     return;
   }
 
   var div = document.getElementById('plugin-wrapper');
   var plugin = document.createElement('embed');
   plugin.setAttribute('type', remoting.PLUGIN_MIMETYPE);
@@ skipping 14 matching lines @@
     var accessCode = plugin.accessCode;
     var accessCodeDisplay = document.getElementById('access-code-display');
     accessCodeDisplay.innerText = accessCode;
     setHostMode('ready-to-share');
   } else if (state == plugin.CONNECTED) {
     setHostMode('shared');
   } else if (state == plugin.DISCONNECTED) {
     setHostMode('unshared');
     plugin.parentNode.removeChild(plugin);
   } else {
-    window.alert('Unknown state -> ' + state);
+    addToDebugLog('Unknown state -> ' + state);
   }
 }
 
 function cancelShare() {
+  addToDebugLog('Canceling share...');
   var plugin = document.getElementById(remoting.HOST_PLUGIN_ID);
   plugin.disconnect();
 }
 
 function startSession_() {
+  addToDebugLog('Starting session...');
   remoting.username = remoting.getItem(remoting.XMPP_LOGIN_NAME);
   document.location = 'remoting_session.html';
 }
 
 function showConnectError_(responseCode, responseString) {
   var invalid = document.getElementById('invalid-access-code');
   var other = document.getElementById('other-connect-error');
   if (responseCode == 404) {
     invalid.style.display = 'block';
     other.style.display = 'none';
@@ skipping 42 matching lines @@
     xhr.setRequestHeader('Authorization',
                          'OAuth ' + remoting.oauth2.getAccessToken());
     xhr.send(null);
 }
 
 function tryConnect() {
   if (remoting.oauth2.needsNewAccessToken()) {
     remoting.oauth2.refreshAccessToken(function() {
       if (remoting.oauth2.needsNewAccessToken()) {
         // If we still need it, we're going to infinite loop.
-        throw "Unable to get access token";
+        throw "Unable to get access token.";
       }
       tryConnect();
     });
     return;
   }
   var accessCode = document.getElementById('access-code-entry').value;
   remoting.accessCode = accessCode;
   // TODO(jamiewalch): Since the mapping from (SupportId, HostSecret) to
   // AccessCode is not yet defined, assume it's hyphen-separated for now.
   var parts = remoting.accessCode.split('-');
   if (parts.length != 2) {
     showConnectError_(404);
   } else {
     setClientMode('connecting');
     resolveSupportId(parts[0]);
   }
 }
 
 function cancelConnect() {
   remoting.accessCode = '';
   setClientMode('unconnected');
 }