[MD History] Add grouped history toolbar.

chrome/browser/resources/md_history/app.js

Index: chrome/browser/resources/md_history/app.js
diff --git a/chrome/browser/resources/md_history/app.js b/chrome/browser/resources/md_history/app.js
index 29ebdf37bc8108548308fcd88bf17ec144f0f146..14cac1a05eceb66a90a1c15b9212573ae821555c 100644
--- a/chrome/browser/resources/md_history/app.js
+++ b/chrome/browser/resources/md_history/app.js
@@ -21,6 +21,10 @@ Polymer({
     'search-changed': 'searchChanged',
   },
 
+  ready: function() {
+    this.$.toolbar.isGroupedMode = loadTimeData.getBoolean('groupByDomain');
+  },
+
   /**
    * Listens for history-item being selected or deselected (through checkbox)
    * and changes the view of the top toolbar.
@@ -84,6 +88,10 @@ Polymer({
     /** @type {HistoryToolbarElement} */(this.$.toolbar).searching = false;
     if (info.finished)
       list.disableResultLoading();
+
+    var toolbar = /** @type {HistoryToolbarElement} */(this.$.toolbar);
+    toolbar.queryStartTime = info.queryStartTime;
+    toolbar.queryEndTime = info.queryEndTime;
   },
 
   /**