Add the partial screen magnifier to Chrome OS.

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.define('options', function() {
   var OptionsPage = options.OptionsPage;
   var ArrayDataModel = cr.ui.ArrayDataModel;
   var RepeatingButton = cr.ui.RepeatingButton;
 
   //
@@ skipping 424 matching lines @@
         $('accessibility-spoken-feedback-check').onchange = function(event) {
           chrome.send('spokenFeedbackChange',
                       [$('accessibility-spoken-feedback-check').checked]);
         };
 
         $('accessibility-high-contrast-check').onchange = function(event) {
           chrome.send('highContrastChange',
                       [$('accessibility-high-contrast-check').checked]);
         };
 
-        $('accessibility-screen-magnifier-check').onchange = function(event) {
+        $('accessibility-screen-magnifier-type').onchange = function(event) {
           chrome.send('screenMagnifierChange',
-                      [$('accessibility-screen-magnifier-check').checked]);
+                      [$('accessibility-screen-magnifier-type').value]);
         };
       }
 
       // Display management section (CrOS only).
       if (cr.isChromeOS) {
         $('display-options').onclick = function(event) {
           OptionsPage.navigateToPage('display');
           chrome.send('coreOptionsUserMetricsAction',
                       ['Options_Display']);
         };
@@ skipping 706 matching lines @@
 
     /**
      * Set the initial state of the high contrast checkbox.
      * @private
      */
     setHighContrastCheckboxState_: function(checked) {
       $('accessibility-high-contrast-check').checked = checked;
     },
 
     /**
-     * Set the initial state of the screen magnifier checkbox.
+     * Set the initial state of the screen magnifier dropdown.
      * @private
      */
-    setScreenMagnifierCheckboxState_: function(checked) {
-      $('accessibility-screen-magnifier-check').checked = checked;
+    setScreenMagnifierTypeState_: function(type) {
+      $('accessibility-screen-magnifier-type').value = type;
     },
 
     /**
      * Set the initial state of the virtual keyboard checkbox.
      * @private
      */
     setVirtualKeyboardCheckboxState_: function(checked) {
       // TODO(zork): Update UI
     },
 
@@ skipping 123 matching lines @@
     'setBackgroundModeCheckboxState',
     'setBluetoothState',
     'setCheckRevocationCheckboxState',
     'setFontSize',
     'setGtkThemeButtonEnabled',
     'setHighContrastCheckboxState',
     'setMetricsReportingCheckboxState',
     'setMetricsReportingSettingVisibility',
     'setPasswordGenerationSettingVisibility',
     'setProfilesInfo',
-    'setScreenMagnifierCheckboxState',
+    'setScreenMagnifierTypeState',
     'setSpokenFeedbackCheckboxState',
     'setThemesResetButtonEnabled',
     'setupCloudPrintConnectorSection',
     'setupPageZoomSelector',
     'setupProxySettingsSection',
     'setVirtualKeyboardCheckboxState',
     'showBluetoothSettings',
     'showDisplayOptions',
     'showMouseControls',
     'showTouchpadControls',
@@ skipping 20 matching lines @@
     BrowserOptions.getLoggedInUsername = function() {
       return BrowserOptions.getInstance().username_;
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });