[MD History] Add UMA stats for switching views and the CBD button.

chrome/browser/resources/md_history/app.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/html/cr/ui.html">
 <link rel="import" href="chrome://resources/html/cr/ui/command.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/app-layout/app-drawer/app-drawer.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/app-route/app-location.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/app-route/app-route.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-media-query/iron-media-query.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/iron-pages/iron-pages.html">
 <link rel="import" href="chrome://history/history_toolbar.html">
 <link rel="import" href="chrome://history/list_container.html">
@@ skipping 76 matching lines @@
           selected="[[getSelectedPage_(selectedPage_, items)]]"
           items="{{items}}">
         <history-list-container id="history" query-state="{{queryState_}}"
             query-result="[[queryResult_]]" grouped="[[grouped_]]"
             path="history">
         </history-list-container>
         <template is="dom-if" if="[[syncedTabsSelected_(selectedPage_)]]">
           <history-synced-device-manager id="synced-devices"
               session-list="[[queryResult_.sessionList]]"
               search-term=[[queryState_.searchTerm]]
+              sign-in-state={{isUserSignedIn}}

[tsergeant, 2016/08/15 02:48:38]

This and the above should have "quotes"

[calamity, 2016/08/15 05:59:18]

#howdidthiseverwork

[Dan Beam, 2016/08/15 18:07:05]

https://www.w3.org/TR/2011/WD-html5-20110113/tokenization.html#attribute-valu...

               path="syncedTabs">
           </history-synced-device-manager>
         </template>
       </iron-pages>
     </div>
 
     <template is="dom-if" if="[[hasDrawer_]]">
       <app-drawer id="drawer" swipe-open align="start" tabindex="0">
         <div id="drawer-header">
           <h1>$i18n{title}</h1>
         </div>
         <history-side-bar id="drawer-side-bar" selected-page="[[selectedPage_]]"
             route="[[route_]]" show-footer="[[showSidebarFooter]]" drawer>
         </history-side-bar>
       </app-drawer>
     </template>
 
     <iron-media-query query="(max-width: 1023px)"
         query-matches="{{hasDrawer_}}">
     </iron-media-query>
   </template>
   <script src="chrome://history/app.js"></script>
 </dom-module>