ChromeOS OOBE: rename and add new attributes to oobe-dialog

chrome/browser/resources/chromeos/login/oobe_dialog.html

 <!-- 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. -->
 
 <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/paper-styles/color.html">
 
 <!--
   Simple OOBE dialog which should be used for OOBE UI elements.
   It has correct size and padding. It can display top left icon, and has
@@ skipping 26 matching lines @@
   with clases |footer|, |bottom-buttons|.
 
   For single-DPI image |oobe-icon| class should be used. To select between two
   images of different DPI, |oobe-icon-1x| and |oobe-icon-2x| should be used
   instead. For example:
 
       <iron-icon icon="icon1" ... class="oobe-icon oobe-icon-1x">
       <iron-icon icon-"icon2" ... class="oobe-icon oobe-icon-2x">
 
   |bottom-buttons| block is shown only if |has-buttons| attribute is set.
+
+  Attributes:
+    no-header - hides header
+    no-footer-padding - disables footer padding.
+    has-buttons - shows bottom buttons menu
+
+  I.e. [no-header no-footer-padding] will make the footer occupy all the dialog
+  space.
 -->
 <dom-module id="oobe-dialog">
   <template>
     <link rel="stylesheet" href="oobe_dialog_host.css">
     <link rel="stylesheet" href="oobe_dialog.css">
-    <div id="header-container">
+    <div id="header-container" hidden="[[noHeader]]">
       <div class="oobe-icon-div">
         <content select=".oobe-icon"></content>
       </div>
       <div class="oobe-header layout vertical">
         <content select=".header"></content>
       </div>
     </div>
-    <div id="footer-container" noFooter$="[[noFooter]]"
+    <div id="footer-container" noFooterPadding$="[[noFooterPadding]]"
         class="flex layout vertical">
       <content select=".footer"></content>
     </div>
     <template is="dom-if" if="[[hasButtons]]">
       <div id="oobe-bottom" hideShadow$="[[hideShadow]]"
           class="layout horizontal center">
         <content select=".bottom-buttons"></content>
       </div>
     </template>
   </template>
 </dom-module>