arc: Handle ARC events in MD Settings

chrome/browser/resources/settings/android_apps_page/android_apps_subpage.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
  * 'android-apps-subpage' is the settings subpage for managing android apps.
  */
 
 Polymer({
   is: 'settings-android-apps-subpage',
 
   behaviors: [I18nBehavior, PrefsBehavior],
 
   properties: {
     /** Preferences state. */
     prefs: Object,
 
     /** @private {!AndroidAppsInfo|undefined} */
-    androidAppsInfo: Object,
+    androidAppsInfo: {
+      type: Object,
+      observer: 'onAndroidAppsInfoUpdate_',
+    },
 
     /** @private */
     dialogBody_: {
       type: String,
       value: function() {
         return this.i18nAdvanced(
             'androidAppsDisableDialogMessage',
             {substitutions: [], tags: ['br']});
       }
     }
   },
 
   /** @private {?settings.AndroidAppsBrowserProxy} */
   browserProxy_: null,
 
   /** @override */
   created: function() {
     this.browserProxy_ = settings.AndroidAppsBrowserProxyImpl.getInstance();
   },
 
   /**
+   * @param {AndroidAppsInfo} info
+   * @private
+   */
+  onAndroidAppsInfoUpdate_: function() {
+    if (!this.androidAppsInfo.playStoreEnabled)
+      settings.navigateToPreviousRoute();
+  },
+
+  /**
    * @param {Event} event
    * @private
    */
   onManageAndroidAppsKeydown_: function(event) {
     if (event.key != 'Enter' && event.key != ' ')
       return;
     this.browserProxy_.showAndroidAppsSettings(true /** keyboardAction */);
     event.stopPropagation();
   },
 
@@ skipping 37 matching lines @@
    */
   onConfirmDisableDialogCancel_: function() {
     this.$.confirmDisableDialog.close();
   },
 
   /** @private */
   onConfirmDisableDialogClose_: function() {
     cr.ui.focusWithoutInk(assert(this.$$('#remove button')));
   },
 });