[MD History] Make forward/backward work in grouped mode.

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/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://resources/polymer/v1_0/iron-scroll-target-behavior/iron-scroll-target-behavior.html">
 <link rel="import" href="chrome://history/history_toolbar.html">
 <link rel="import" href="chrome://history/list_container.html">
 <link rel="import" href="chrome://history/router.html">
 <link rel="import" href="chrome://history/shared_style.html">
@@ skipping 78 matching lines @@
       }
 
       :host([toolbar-shadow_]) #drop-shadow {
         opacity: 1;
       }
     </style>
     <history-router selected-page="{{selectedPage_}}"
         query-state="{{queryState_}}">
     </history-router>
     <history-toolbar id="toolbar"
+        grouped-offset="{{queryState_.groupedOffset}}"
+        grouped-range="{{queryState_.range}}"
+        has-drawer="[[hasDrawer_]]"
+        is-grouped-mode="{{grouped_}}"
+        query-end-time="[[queryResult_.info.queryEndTime]]"
+        has-more-results="[[!queryResult_.info.finished]]"
+        query-start-time="[[queryResult_.info.queryStartTime]]"
+        querying="[[queryState_.querying]]"
+        search-term="{{queryState_.searchTerm}}"
+        show-menu-promo="[[showMenuPromo_]]"
+        show-sync-notice="[[showSyncNotice_(hasSyncedResults, selectedPage_)]]"
         spinner-active="[[shouldShowSpinner_(queryState_.querying,
                                              queryState_.incremental,
-                                             queryState_.searchTerm)]]"
-        is-grouped-mode="{{grouped_}}"
-        grouped-range="{{queryState_.range}}"
-        search-term="{{queryState_.searchTerm}}"
-        query-start-time="[[queryResult_.info.queryStartTime]]"
-        query-end-time="[[queryResult_.info.queryEndTime]]"
-        has-drawer="[[hasDrawer_]]"
-        show-sync-notice="[[showSyncNotice_(hasSyncedResults, selectedPage_)]]"
-        show-menu-promo="[[showMenuPromo_]]">
+                                             queryState_.searchTerm)]]">
     </history-toolbar>
 
     <div id="main-container">
       <history-side-bar id="content-side-bar" selected-page="{{selectedPage_}}"
           show-footer="[[showSidebarFooter]]"
           hidden$="[[hasDrawer_]]">
       </history-side-bar>
       <iron-pages id="content" attr-for-selected="path"
           fallback-selection="history"
           selected="[[getSelectedPage_(selectedPage_, items)]]"
@@ skipping 24 matching lines @@
         </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>