MD Settings: Save and restore scroll position in iron-list

chrome/browser/resources/settings/bluetooth_page/bluetooth_page.html

 <link rel="import" href="chrome://resources/cr_elements/cr_scrollable_behavior.html">
 <link rel="import" href="chrome://resources/cr_elements/policy/cr_policy_pref_indicator.html">
 <link rel="import" href="chrome://resources/html/i18n_behavior.html">
 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-collapse/iron-collapse.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-flex-layout/classes/iron-flex-layout.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-list/iron-list.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/neon-animation/neon-animatable.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-button/paper-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-toggle-button/paper-toggle-button.html">
@@ skipping 48 matching lines @@
                 disabled="[[!adapterState_.available]]"
                 on-change="onBluetoothEnabledChange_" on-tap="stopTap_">
             </paper-toggle-button>
           </div>
         </div>
         <iron-collapse opened="[[canShowDeviceList_(bluetoothEnabled_,
                                                     deviceListExpanded_)]]">
           <div id="deviceList" class="list-frame vertical-list"
               on-device-event="onDeviceEvent_">
             <div id="container" class="layout vertical" scrollable>
-              <iron-list items="[[getPairedOrConnecting_(deviceList_.*)]]"
+              <iron-list id="devices"  items="[[pairedDeviceList_]]"

[Dan Beam, 2017/02/01 06:13:17]

nit: remove extra space

[stevenjb, 2017/02/02 01:17:47]

Done.

                   selection-enabled selected-item="{{selectedItem_}}"
                   scroll-target="container">
                 <template>
                   <bluetooth-device-list-item device="[[item]]"
                       tabindex$="[[tabIndex]]">
                   </bluetooth-device-list-item>
                 </template>
               </iron-list>
             </div>
             <div class="no-devices layout horizontal center"
@@ skipping 20 matching lines @@
           on-device-event="onDeviceEvent_"
           on-response="onResponse_"
           pairing-device="[[pairingDevice_]]"
           pairing-event="[[pairingEvent_]]">
       </bluetooth-device-dialog>
     </template>
 
   </template>
   <script src="bluetooth_page.js"></script>
 </dom-module>