Add local protection setting to chrome://settings/system

chrome/browser/resources/settings/system_page/system_page_browser_proxy.js

 // Copyright 2016 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.
 
 /** @fileoverview Handles interprocess communcation for the system page. */
 
 cr.define('settings', function() {
   /** @interface */
   class SystemPageBrowserProxy {
     /** Shows the native system proxy settings. */
     showProxySettings() {}
 
     /**
      * @return {boolean} Whether hardware acceleration was enabled when the user
      *     started Chrome.
      */
     wasHardwareAccelerationEnabledAtStartup() {}
+
+    /**
+     * @return {boolean} Whether to show the setting that controls use of
+     *     protection.
+     */
+    hideProtectionSetting() {}
+
+    /**
+     * @return {boolean} // TODO(cfroussios)
+     */
+    protectionSetting() {}
+
+    setProtectionSetting(enabled) {}
   }
 
   /**
    * @implements {settings.SystemPageBrowserProxy}
    */
   class SystemPageBrowserProxyImpl {
     /** @override */
     showProxySettings() {
       chrome.send('showProxySettings');
     }
 
     /** @override */
     wasHardwareAccelerationEnabledAtStartup() {
       return loadTimeData.getBoolean('hardwareAccelerationEnabledAtStartup');
     }
+
+    /** @override */
+    hideProtectionSetting() {
+      return loadTimeData.getBoolean('hideProtectionSetting');
+    }
+
+    /** @override */
+    protectionSetting() {
+      return loadTimeData.getBoolean('protectionSetting');
+    }
+
+    setProtectionSetting(enabled) {
+      chrome.send('updateProtectionSetting', [enabled]);
+    }
   }
 
   cr.addSingletonGetter(SystemPageBrowserProxyImpl);
 
   return {
     SystemPageBrowserProxy: SystemPageBrowserProxy,
     SystemPageBrowserProxyImpl: SystemPageBrowserProxyImpl,
   };
 });