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 35f7510e2ea4e09118632099c9e23ddf8120a36c..ca9af7fc869f7c52c5ac1988c86a70f626c33b74 100644
--- a/chrome/browser/resources/options2/browser_options.js
+++ b/chrome/browser/resources/options2/browser_options.js
@@ -466,6 +466,11 @@ cr.define('options', function() {
           chrome.send('spokenFeedbackChange',
           [$('accessibility-spoken-feedback-check').checked]);
         };
+
+        $('accessibility-high-contrast-check').onchange = function(event) {
+          chrome.send('highContrastChange',
+          [$('accessibility-high-contrast-check').checked]);
+        };
       }
 
       // Background mode section.
@@ -1201,7 +1206,7 @@ cr.define('options', function() {
      * @private
      */
     setHighContrastCheckboxState_: function(checked) {
-      // TODO(zork): Update UI
+      $('accessibility-high-contrast-check').checked = checked;
     },
 
     /**