Implement High Contrast mode for Chrome OS

chrome/browser/resources/options2/browser_options.js

Index: chrome/browser/resources/options2/browser_options.js
diff --git a/chrome/browser/resources/options2/browser_options.js b/chrome/browser/resources/options2/browser_options.js
index 247ee6545983c457c8909c4eea2c6db5a238353d..7567ac23e80239833b4cb01b126b86d3558843a8 100644
--- a/chrome/browser/resources/options2/browser_options.js
+++ b/chrome/browser/resources/options2/browser_options.js
@@ -464,7 +464,12 @@ cr.define('options', function() {
       if (cr.isChromeOS) {
         $('accessibility-spoken-feedback-check').onchange = function(event) {
           chrome.send('spokenFeedbackChange',
-          [$('accessibility-spoken-feedback-check').checked]);
+                      [$('accessibility-spoken-feedback-check').checked]);
+        };
+
+        $('accessibility-high-contrast-check').onchange = function(event) {
+          chrome.send('highContrastChange',
+                      [$('accessibility-high-contrast-check').checked]);
         };
       }
 
@@ -1212,7 +1217,7 @@ cr.define('options', function() {
      * @private
      */
     setHighContrastCheckboxState_: function(checked) {
-      // TODO(zork): Update UI
+      $('accessibility-high-contrast-check').checked = checked;
     },
 
     /**