MD Settings: Show/hide spinner when searching starts/ends.

chrome/browser/resources/settings/settings_ui/settings_ui.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-ui' implements the UI for the Settings page.
  *
  * Example:
  *
@@ skipping 14 matching lines @@
       observer: 'directionDelegateChanged_',
       type: Object,
     },
 
     appealClosed_: {
       type: Boolean,
       value: function() {
         return !!(sessionStorage.appealClosed_ || localStorage.appealClosed_);
       },
     },
+
+    /** @private {boolean} */
+    toolbarSpinnerActive_: {

[dpapad, 2016/07/19 00:36:42]

This boolean variable is bound to |spinnerActive| of cr-toolbar. Changing this
boolean makes cr-toolbar show/hide the spinner.

To be more precise, settings-main changes its own |toolbarSpinnerActive| which
is bound to settings-ui's |toolbarSpinnerActive_| which is bound to cr-toolbar's
|spinnerActive|.

+      type: Boolean,
+      value: false,
+    },
   },
 
   listeners: {
     'sideNav.iron-activate': 'onIronActivate_',
   },
 
   /** @private */
   onCloseAppealTap_: function() {
     sessionStorage.appealClosed_ = this.appealClosed_ = true;
   },
@@ skipping 18 matching lines @@
       this.$$('settings-main').searchContents(e.detail);
     }.bind(this));
   },
 
   /** @private */
   directionDelegateChanged_: function() {
     this.$$('app-drawer').align = this.directionDelegate.isRtl() ?
         'right' : 'left';
   },
 });