MD Settings: disable <paper-radio-button>s inside of a <settings-radio-group> when controlled

chrome/browser/resources/settings/controls/settings_radio_group.js

Index: chrome/browser/resources/settings/controls/settings_radio_group.js
diff --git a/chrome/browser/resources/settings/controls/settings_radio_group.js b/chrome/browser/resources/settings/controls/settings_radio_group.js
index a9bc71dc07eca16fade086dd9b6e4a54868dce5b..389ebcd4fa1776ceaab9946dfeeb9e961918ff14 100644
--- a/chrome/browser/resources/settings/controls/settings_radio_group.js
+++ b/chrome/browser/resources/settings/controls/settings_radio_group.js
@@ -15,9 +15,15 @@
 Polymer({
   is: 'settings-radio-group',
 
-  behaviors: [PrefControlBehavior],
+  behaviors: [CrPolicyPrefBehavior, PrefControlBehavior],
 
   properties: {
+    disabled_: {
+      observer: 'disabledChanged_',
+      type: Boolean,
+      value: false,
+    },
+
     /**
      * IronSelectableBehavior selected attribute.
      */
@@ -34,8 +40,17 @@ Polymer({
 
   /** @private */
   prefChanged_: function() {
-    this.selected = Settings.PrefUtil.prefToString(
-        /** @type {!chrome.settingsPrivate.PrefObject} */(this.pref));
+    var pref = /** @type {!chrome.settingsPrivate.PrefObject} */(this.pref);
+    this.disabled_ = this.isPrefPolicyControlled(pref);
+    this.selected = Settings.PrefUtil.prefToString(pref);
+  },
+
+  /** @private */
+  disabledChanged_: function() {
+    var radioButtons = this.queryAllEffectiveChildren('paper-radio-button');
+    for (var i = 0; i < radioButtons.length; ++i) {
+      radioButtons[i].disabled = this.disabled_;
+    }
   },
 
   /** @private */