MD Settings: Associate suppages with the controls that trigger them.

chrome/browser/resources/settings/settings_page/settings_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
  * 'settings-subpage' shows a subpage beneath a subheader. The header contains
  * the subpage title and a back icon. The back icon fires an event which
  * is caught by settings-animated-pages, so it requires no separate handling.
  */
@@ skipping 11 matching lines @@
     pageTitle: String,
 
     /** Setting a |searchLabel| will enable search. */
     searchLabel: String,
 
     searchTerm: {
       type: String,
       notify: true,
       value: '',
     },
+
+    /** @type {?HTMLElement} */
+    associatedControl: {
+      type: Object,
+      value: null,
+    },
+
+    /**
+     * Indicates whether an associated control (an element that triggers the
+     * subpage) is not registered for this page. Used by the searching algorithm
+     * to show search bubbles.
+     */
+    noAssociatedControl: {
+      type: Boolean,
+      value: false,
+    },
   },
 
   /** @private */
   onTapBack_: function() {
     // Event is caught by settings-animated-pages.
     this.fire('subpage-back');
   },
 
   /** @private */
   onSearchChanged_: function(e) {
     this.searchTerm = e.detail;
   },
 });