MD History: Add routing for grouped history mode.

chrome/browser/resources/md_history/app.html

Index: chrome/browser/resources/md_history/app.html
diff --git a/chrome/browser/resources/md_history/app.html b/chrome/browser/resources/md_history/app.html
index fe1522c3dfea714196fd7fa441f4f95a0cd72b55..d26c901b7dd7d98a8ebd7ede331825c2a964cab6 100644
--- a/chrome/browser/resources/md_history/app.html
+++ b/chrome/browser/resources/md_history/app.html
@@ -72,9 +72,12 @@
       }
     </style>
     <history-query-manager query-state="{{queryState_}}"
-        query-result="[[queryResult_]]">
+        query-result="[[queryResult_]]"
+        router="[[$$('#router')]]">
     </history-query-manager>
-    <history-router selected-page="{{selectedPage_}}"
+    <history-router id="router"
+        selected-page="{{selectedPage_}}"
+        grouped="[[grouped_]]"
         query-state="[[queryState_]]">
     </history-router>
     <history-toolbar id="toolbar"