chromium-status: add status field help text

static/js/main/main.js

+// Copyright (c) 2013 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.
+
+/*
+ * Code for the main user-visible status page.
+ */
+
+window.onload = function() {
+  document.add_new_message.message.focus();
+  help_init();
+}
+
+/*
+ * Functions for managing the help text.
+ */
+
+function help_init() {
+  // Set up the help text logic.
+  var message = document.add_new_message.message;
+  message.onmouseover = help_show;
+  message.onmousemove = help_show;
+  message.onmouseout = help_hide;
+
+  var help = document.getElementById('help');
+  help.onmouseover = help_show;
+  help.onmouseout = help_hide;
+}
+
+function help_show() {
+  var message = document.add_new_message.message;
+  var help = document.getElementById('help');
+  help.style.left = message.offsetLeft + 'px';
+  help.style.top = message.offsetTop + message.offsetHeight + 'px';
+  help.hidden = false;
+}
+
+function help_hide() {
+  var help = document.getElementById('help');
+  help.hidden = true;
+}