The chromoting client sends simple logging to the server.

remoting/webapp/me2mom/log_to_server.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.
+
+/**
+ * @fileoverview
+ * Module for sending log entries to the server.
+ */
+
+'use strict';
+
+/** @suppress {duplicate} */
+var remoting = remoting || {};
+
+/**
+ * @constructor
+ */
+remoting.LogToServer = function() {
+  /** @type Array.<string> */ this.pendingEntries = [];
+};
+
+/**
+ * Logs a client session state change.
+ *
+ * @param {remoting.ClientSession.State} state
+ * @param {remoting.ClientSession.ConnectionError} connectionError
+ */
+remoting.LogToServer.prototype.logClientSessionStateChange =
+    function(state, connectionError) {
+  var entry = remoting.ServerLogEntry.prototype.makeClientSessionStateChange(

[Jamie, 2011/11/11 19:08:40]

If this is effectively a static function, there's no need to add it to the
prototype. I was actually thinking along the lines of a constructor function,
but since we'd want to overload it, a static factory method is probably cleaner.

+      state, connectionError);
+  entry.addHostFields();
+  entry.addChromeVersionField();
+  entry.addWebappVersionField();
+  this.log(entry);
+};
+
+/**
+ * Sends a log entry to the server.
+ *
+ * @private
+ * @param {remoting.ServerLogEntry} entry
+ */
+remoting.LogToServer.prototype.log = function(entry) {
+  // Store a stanza for the entry
+  this.pendingEntries.push(entry.toStanza());
+  // Stop if there's no connection to the server.
+  if (!remoting.wcs) {
+    return;
+  }
+  // Send all pending entries to the server.
+  var stanza = '<cli:iq to="remoting@bot.talk.google.com" type="set" ' +
+      'xmlns:cli="jabber:client"><gr:log xmlns:gr="google:remoting">';
+  while (this.pendingEntries.length > 0) {
+    stanza += /** @type string */ this.pendingEntries.shift();
+  }
+  stanza += '</gr:log></cli:iq>';
+  remoting.debug.logIq(true, stanza);
+  remoting.wcs.sendIq(stanza);
+};