The webapp uses localStorage to decide whether logging to the server

remoting/webapp/me2mom/server_log_entry.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
  * A class of server log entries.
  */
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /**
  * @private
  * @constructor
  */
 remoting.ServerLogEntry = function() {
   /** @type Object.<string, string> */ this.dict = {};
 };
 
 /** @private */
 remoting.ServerLogEntry.prototype.KEY_EVENT_NAME_ = 'event-name';
 /** @private */
 remoting.ServerLogEntry.prototype.VALUE_EVENT_NAME_SESSION_STATE_ =
     'session-state';
 
 /** @private */
+remoting.ServerLogEntry.prototype.KEY_ID_ = 'id';
+
+/** @private */
 remoting.ServerLogEntry.prototype.KEY_ROLE_ = 'role';
 /** @private */
 remoting.ServerLogEntry.prototype.VALUE_ROLE_CLIENT_ = 'client';
 
 /** @private */
 remoting.ServerLogEntry.prototype.KEY_SESSION_STATE_ = 'session-state';
 
 /**
  * @private
  * @param {remoting.ClientSession.State} state
@@ skipping 112 matching lines @@
   entry.set(this.KEY_EVENT_NAME_, this.VALUE_EVENT_NAME_SESSION_STATE_);
   entry.set(this.KEY_SESSION_STATE_, this.getValueForSessionState(state));
   if (connectionError != remoting.ClientSession.ConnectionError.NONE) {
     entry.set(this.KEY_CONNECTION_ERROR_,
               this.getValueForConnectionError(connectionError));
   }
   return entry;
 };
 
 /**
+ * Adds an ID field to this log entry.
+ *
+ * @param {string} id
+ */
+remoting.ServerLogEntry.prototype.addIdField = function(id) {
+  this.set(this.KEY_ID_, id);
+}
+
+/**
  * Adds fields describing the host to this log entry.
  */
 remoting.ServerLogEntry.prototype.addHostFields = function() {
   var host = this.getHostData();
   if (host) {
     if (host.os_name.length > 0) {
       this.set(this.KEY_OS_NAME_, host.os_name);
     }
     if (host.os_version.length > 0) {
       this.set(this.KEY_OS_VERSION_, host.os_version);
@@ skipping 100 matching lines @@
   }
   return null;
 };
 
 /**
  * Adds a field specifying the webapp version to this log entry.
  */
 remoting.ServerLogEntry.prototype.addWebappVersionField = function() {
   this.set(this.KEY_WEBAPP_VERSION_, chrome.app.getDetails().version);
 };