MD Settings: show an extension-controlled-indicator for proxy

chrome/browser/resources/settings/prefs/prefs.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
  * 'settings-prefs' exposes a singleton model of Chrome settings and
  * preferences, which listens to changes to Chrome prefs whitelisted in
  * chrome.settingsPrivate. When changing prefs in this element's 'prefs'
  * property via the UI, the singleton model tries to set those preferences in
@@ skipping 209 matching lines @@
       CrSettingsPrefs.setInitialized();
     },
 
     /**
      * Checks the result of calling settingsPrivate.setPref.
      * @param {string} key The key used in the call to setPref.
      * @param {boolean} success True if setting the pref succeeded.
      * @private
      */
     setPrefCallback_: function(key, success) {
-      if (success)
-        return;
+      if (!success)
+        this.refresh(key);
+    },
 
-      // Get the current pref value from chrome.settingsPrivate to ensure the
-      // UI stays up to date.
+    /**
+     * Get the current pref value from chrome.settingsPrivate to ensure the UI
+     * stays up to date.
+     * @param {string} key
+     * @private
+     */
+    refresh: function(key) {
       this.settingsApi_.getPref(key, function(pref) {
         this.updatePrefs_([pref]);
       }.bind(this));
     },
 
     /**
      * Updates the prefs model with the given prefs.
      * @param {!Array<!chrome.settingsPrivate.PrefObject>} newPrefs
      * @private
      */
@@ skipping 49 matching lines @@
       this.prefs = undefined;
       this.lastPrefValues_ = {};
       this.initialized_ = false;
       // Remove the listener added in initialize().
       this.settingsApi_.onPrefsChanged.removeListener(this.boundPrefsChanged_);
       this.settingsApi_ =
           /** @type {SettingsPrivate} */(chrome.settingsPrivate);
     },
   });
 })();