ChromeOS: Implement periodic timezone refresh on geolocation data.

chrome/browser/resources/options/browser_options.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.
 
 cr.exportPath('options');
 
 /**
  * @typedef {{actionLinkText: (string|undefined),
  *            childUser: (boolean|undefined),
  *            hasError: (boolean|undefined),
@@ skipping 368 matching lines @@
         };
 
         if ($('themes-native-button')) {
           $('themes-native-button').onclick = function(event) {
             chrome.send('themesSetNative');
           };
         }
       }
 
       // Date and time section (CrOS only).
-      if ($('set-time-button'))
-        $('set-time-button').onclick = this.handleSetTime_.bind(this);
+      if (cr.isChromeOS) {
+        if ($('set-time-button'))
+          $('set-time-button').onclick = this.handleSetTime_.bind(this);
+
+        // Timezone
+        if (loadTimeData.getBoolean('enableTimeZoneTrackingOption')) {
+          $('resolve-timezone-by-geolocation-selection').hidden = false;
+          this.setSystemTimezoneManaged_(false);
+        }
+      }
 
       // Default browser section.
       if (!cr.isChromeOS) {
         if (!loadTimeData.getBoolean('showSetDefault')) {
           $('set-default-browser-section').hidden = true;
         }
         $('set-as-default-browser').onclick = function(event) {
           chrome.send('becomeDefaultBrowser');
         };
 
@@ skipping 1206 matching lines @@
         this.enableElementIfPossible_(getRequiredElement('set-wallpaper'));
 
       // Create a synthetic pref change event decorated as
       // CoreOptionsHandler::CreateValueForPref() does.
       var event = new Event('wallpaper');
       event.value = managed ? { controlledBy: 'policy' } : {};
       $('wallpaper-indicator').handlePrefChange(event);
     },
 
     /**
+     * This is called from chromium code when system timezone "managed" state
+     * is changed. Enables or disables dependent settings.
+     * @param {boolean} managed Is true when system Timezone is managed by
+     *     enterprise policy. False otherwize.
+     */
+    setSystemTimezoneManaged_: function(managed) {
+      if (loadTimeData.getBoolean('enableTimeZoneTrackingOption')) {
+        if (managed) {
+          $('resolve-timezone-by-geolocation-selection').disabled = true;
+          $('resolve-timezone-by-geolocation').onclick = function(event) {};
+        } else {
+          this.enableElementIfPossible_(
+              getRequiredElement('resolve-timezone-by-geolocation-selection'));
+          $('resolve-timezone-by-geolocation').onclick = function(event) {
+            $('timezone-value-select').disabled = event.currentTarget.checked;
+          };
+          $('timezone-value-select').disabled =
+              $('resolve-timezone-by-geolocation').checked;
+        }
+      }
+    },
+
+    /**
      * Handle the 'add device' button click.
      * @private
      */
     handleAddBluetoothDevice_: function() {
       chrome.send('coreOptionsUserMetricsAction',
                   ['Options_BluetoothShowAddDevice']);
       chrome.send('findBluetoothDevices');
       PageManager.showPageByName('bluetooth', false);
     },
 
@@ skipping 576 matching lines @@
       }
       button.textContent = loadTimeData.getString(strId);
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });