Add ArcEnabled policy implementation

chrome/browser/resources/options/browser_options.js

Index: chrome/browser/resources/options/browser_options.js
diff --git a/chrome/browser/resources/options/browser_options.js b/chrome/browser/resources/options/browser_options.js
index c5347ef445cd9df59bfccc8e4e9445a5a8e30f38..4dfdfb3ca388fd9514696041af2e4805c9b4dc15 100644
--- a/chrome/browser/resources/options/browser_options.js
+++ b/chrome/browser/resources/options/browser_options.js
@@ -2324,10 +2324,11 @@ cr.define('options', function() {
     };
 
     /**
-     * Hides Android Apps settings when they are not available (ChromeOS only).
+     * Hides Android Apps settings when they are not available.

[bartfab (slow), 2016/03/07 13:44:04]

Nit: Does this get unhidden when the policy changes on the fly?

[Polina Bondarenko, 2016/03/09 17:59:15]

This is hidden only if ARC is not available on current device.

E.g. for minnies:
- enterprise user sees grayed-out checkbox and current state of ARC: checked or
not depending on policy. (If policy changes on the fly, then a state of checkbox
changes.)
- Non-enterprise user can manage this checkbox himself.

+     * (Chrome OS only).
      */
     BrowserOptions.hideAndroidAppsSection = function() {
-      var section = $('andorid-apps-section');
+      var section = $('android-apps-section');
       if (section)
         section.hidden = true;
     };