[MD settings] show controlledBy icon for HostApp and platform_app exceptions

chrome/browser/resources/settings/site_settings/site_settings_behavior.js

 // Copyright 2015 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 Behavior common to Site Settings classes.
  */
 
 
 /**
@@ skipping 150 matching lines @@
   expandSiteException: function(exception) {
     var origin = exception.origin;
     var embeddingOrigin = exception.embeddingOrigin;
     var embeddingDisplayName = '';
     if (origin != embeddingOrigin) {
       embeddingDisplayName =
           this.getEmbedderString(embeddingOrigin, this.category);
     }
 
     var enforcement = '';
-    if (exception.source == 'policy' || exception.source == 'extension')
+    if (exception.source == 'extension' || exception.source == 'HostedApp' ||
+        exception.source == 'platform_app' || exception.source == 'policy') {
       enforcement = chrome.settingsPrivate.Enforcement.ENFORCED;
+    }
 
     var controlledBy = kControlledByLookup[exception.source] || '';
 
     return {
       category: this.category,
       origin: origin,
       displayName: exception.displayName,
       embeddingOrigin: embeddingOrigin,
       embeddingDisplayName: embeddingDisplayName,
       incognito: exception.incognito,
       setting: exception.setting,
       enforcement: enforcement,
       controlledBy: controlledBy,
     };
   },
 
 };
 
 /** @polymerBehavior */
 var SiteSettingsBehavior = [SiteSettingsBehaviorImpl];