MD History: promote menu button to show clear browsing data in narrow mode

chrome/browser/resources/md_history/history_toolbar.html

 <link rel="import" href="chrome://resources/html/polymer.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-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-tabs/paper-tab.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-tabs/paper-tabs.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/cr_elements/cr_toolbar/cr_toolbar.html">
+<link rel="import" href="chrome://history/browser_service.html">
 <link rel="import" href="chrome://history/icons.html">
 <link rel="import" href="chrome://history/shared_style.html">
 
 <dom-module id="history-toolbar">
   <template>
     <style include="shared-style">
       :host {
         color: #fff;
         display: block;
         transition: background-color 150ms;
@@ skipping 104 matching lines @@
 
       :host-context([dir=rtl]) .rtl-reversible {
         transform: rotate(180deg);
       }
     </style>
     <div id="toolbar-container">
       <cr-toolbar id="main-toolbar" page-name="$i18n{title}"
           clear-label="$i18n{clearSearch}" search-prompt="$i18n{searchPrompt}"
           hidden$="[[itemsSelected_]]" spinner-active="[[spinnerActive]]"
           show-menu="[[hasDrawer]]" menu-label="$i18n{historyMenuButton}"
-          on-search-changed="onSearchChanged_">
+          on-search-changed="onSearchChanged_"
+          menu-promo="$i18n{menuPromo}" show-menu-promo="[[showMenuPromo_]]"
+          on-cr-menu-promo-shown="onMenuPromoShown_">
       </cr-toolbar>
       <template is="dom-if" if="[[itemsSelected_]]">
         <div id="overlay-wrapper" hidden$="[[!itemsSelected_]]">
           <div id="overlay-buttons">
             <paper-icon-button icon="cr:clear" id="cancel-icon-button"
                 on-tap="onClearSelectionTap_"></paper-icon-button>
             <div id="number-selected">[[numberOfItemsSelected_(count)]]</div>
             <paper-button id="cancel-button" on-tap="onClearSelectionTap_">
               $i18n{cancel}
             </paper-button>
@@ skipping 23 matching lines @@
               class="rtl-reversible"></paper-icon-button>
           <paper-icon-button icon="cr:chevron-right"
               alt="$i18n{rangeNext}" title="$i18n{rangeNext}"
               class="rtl-reversible"></paper-icon-button>
         </div>
       </div>
     </template>
   </template>
   <script src="chrome://history/history_toolbar.js"></script>
 </dom-module>