Add 'Clear local data and reload' button in chrome:drive-internals.

chrome/browser/resources/chromeos/drive_internals.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.
 
 /**
  * Converts a number in bytes to a string in megabytes split by comma into
  * three digit block.
  * @param {number} bytes The number in bytes.
  * @return {string} Formatted string in megabytes.
  */
@@ skipping 233 matching lines @@
     if (item.value != '')
       text += ': ' + item.value;
 
     var li = createElementFromText('li', text);
     if (item.class)
       li.classList.add(item.class);
     ul.appendChild(li);
   }
 }
 
+/**
+ * Updates the text next to the 'reload' button to update the status.
+ * @param {boolean} success whether or not reloading has succeeded.
+ */
+function updateReloadStatus(success) {
+  $('reload-status-text').textContent = (success ? 'success' : 'failed');
+}
+
 document.addEventListener('DOMContentLoaded', function() {
   chrome.send('pageLoaded');
 
   // Update the table of contents.
   var toc = $('toc');
   var sections = document.getElementsByTagName('h2');
   for (var i = 0; i < sections.length; i++) {
     var section = sections[i];
     var a = createElementFromText('a', section.textContent);
     a.href = '#' + section.id;
     var li = document.createElement('li');
     li.appendChild(a);
     toc.appendChild(li);
   }
 
   $('button-clear-access-token').addEventListener('click', function() {
     chrome.send('clearAccessToken');
   });
 
   $('button-clear-refresh-token').addEventListener('click', function() {
     chrome.send('clearRefreshToken');
   });
 
+  $('button-reload-drive-filesystem').addEventListener('click', function() {
+    $('reload-status-text').textContent = 'reloading...';
+    chrome.send('reloadDriveFileSystem');
+  });
+
   $('button-show-file-entries').addEventListener('click', function() {
     var button = $('button-show-file-entries');
     button.parentNode.removeChild(button);
     chrome.send('listFileEntries');
   });
 
   window.setInterval(function() {
     chrome.send('periodicUpdate');
   }, 1000);
 });