Add reset all button to flags page

chrome/browser/resources/flags.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.
 
 /**
  * This variable structure is here to document the structure that the template
  * expects to correctly populate the page.
  */
 
 /**
@@ skipping 31 matching lines @@
     elements[i].onclick = function() {
       handleEnableExperiment(this, true);
       return false;
     };
   }
 
   elements = document.getElementsByClassName('experiment-restart-button');
   for (var i = 0; i < elements.length; ++i) {
     elements[i].onclick = restartBrowser;
   }
+
+  $('experiment-reset-all').onclick = resetAllFlags;
 }
 
 /**
  * Asks the C++ FlagsDOMHandler to get details about the available experiments
  * and return detailed data about the configuration. The FlagsDOMHandler
  * should reply to returnFlagsExperiments() (below).
  */
 function requestFlagsExperimentsData() {
   chrome.send('requestFlagsExperiments');
 }
 
 /**
  * Asks the C++ FlagsDOMHandler to restart the browser (restoring tabs).
  */
 function restartBrowser() {
   chrome.send('restartBrowser');
 }
 
 /**
+ * Reset all flags to their default values and refresh the UI.
+ */
+function resetAllFlags() {
+  // Asks the C++ FlagsDOMHandler to reset all flags to default values.
+  chrome.send('resetAllFlags');
+  requestFlagsExperimentsData();
+}
+
+/**
  * Called by the WebUI to re-populate the page with data representing the
  * current state of installed experiments.
  * @param {Object} flagsExperimentsData Information about available experiments
  *     in the following format:
  *   {
  *     flagsExperiments: [
  *       {
  *         internal_name: 'Experiment ID string',
  *         name: 'Experiment Name',
  *         description: 'description',
@@ skipping 44 matching lines @@
 function handleSelectChoiceExperiment(node, index) {
   // Tell the C++ FlagsDOMHandler to enable the selected choice.
   chrome.send('enableFlagsExperiment',
               [String(node.internal_name) + '@' + index, 'true']);
   requestFlagsExperimentsData();
 }
 
 // Get data and have it displayed upon loading.
 document.addEventListener('DOMContentLoaded', requestFlagsExperimentsData);