Fixed bug where DomMutationObserver failed to notice changes to only character data.

chrome/test/pyautolib/dom_mutation_observer.js

 /* Copyright (c) 2012 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.
  *
  * Helper javascript injected whenever a DomMutationEventObserver is created.
  *
  * This script uses MutationObservers to watch for changes to the DOM, then
  * reports the event to the observer using the DomAutomationController. An
  * anonymous namespace is used to prevent conflict with other Javascript.
  *
@@ skipping 144 matching lines @@
     if (node && nodeAttributeValueEquals(node, attribute, expected_value)) {
       raiseEvent();
       console.log("Matching node in DOM, assuming it was previously added.");
       return;
     }
 
     var obs = new WebKitMutationObserver(addNodeCallback);
     obs.observe(document,
         { childList: true,
           attributes: true,
+          characterData: true,
           subtree: true});
   }
 
   /* Watch for a node matching xpath to be removed from the DOM.
    *
    * Args:
    *  xpath: XPath used to specify the DOM node of interest.
    */
   function observeRemove(xpath) {
     window.domAutomationController.send("success");
@@ skipping 45 matching lines @@
     if (node && nodeAttributeValueEquals(node, attribute, expected_value)) {
       raiseEvent();
       console.log("Node already exists in DOM.");
       return;
     }
 
     var obs = new WebKitMutationObserver(existsNodeCallback);
     obs.observe(document,
         { childList: true,
           attributes: true,
+          characterData: true,
           subtree: true});
   }
 
   /* Interpret arguments and launch the requested observer function. */
   function installMutationObserver() {
     switch (observer_type) {
       case "add":
         observeAdd(xpath);
         break;
       case "remove":
         observeRemove(xpath);
         break;
       case "change":
         observeChange(xpath);
         break;
       case "exists":
         observeExists(xpath);
         break;
     }
     console.log("MutationObserver javscript injection completed.");
   }
 
   /* Ensure the DOM is loaded before attempting to create MutationObservers. */
   if (document.body) {
     installMutationObserver();
   } else {
     window.addEventListener("DOMContentLoaded", installMutationObserver, true);
   }
 }