##<app-scrollpos-control>
app-scrollpos-control is a manager for saving and restoring the scroll position when multiple pages are sharing the same document scroller.
Example:
<app-scrollpos-control selected="{{page}}"></app-scrollpos-control>
<app-drawer-layout>
<app-drawer>
<paper-menu selected="{{page}}">
<paper-item>Home</paper-item>
<paper-item>About</paper-item>
<paper-item>Schedule</paper-item>
<paper-item>Account</paper-item>
</paper-menu>
</app-drawer>
<div>
<app-toolbar>
<paper-icon-button icon="menu" drawer-toggle></paper-icon-button>
</app-toolbar>
<iron-pages selected="{{page}}">
<sample-content size="100"></sample-content>
<sample-content size="100"></sample-content>
<sample-content size="100"></sample-content>
<sample-content size="100"></sample-content>
</iron-pages>
</div>
</app-drawer-layout>