MD History: Add routing for grouped history mode.

chrome/browser/resources/md_history/query_manager.js

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 Polymer({
   is: 'history-query-manager',
 
   properties: {
     /** @type {QueryState} */
     queryState: {
@@ skipping 15 matching lines @@
           },
           get range() {
             return this._range;
           },
         };
       },
     },
 
     /** @type {QueryResult} */
     queryResult: Object,
+
+    /** @type {?HistoryRouterElement} */
+    router: Object,
   },
 
   observers: [
     'searchTermChanged_(queryState.searchTerm)',
   ],
 
   /** @private {!Object<string, !function(!Event)>} */
   documentListeners_: {},
 
   /** @override */
@@ skipping 10 matching lines @@
     for (var e in this.documentListeners_)
       document.removeEventListener(e, this.documentListeners_[e]);
   },
 
   /**
    * @param {boolean} incremental
    * @private
    */
   queryHistory_: function(incremental) {
     var queryState = this.queryState;
-    // Disable querying until the first set of results have been returned. If
-    // there is a search, query immediately to support search query params from
-    // the URL.
-    var noResults = !this.queryResult || this.queryResult.results == null;
-    if (queryState.queryingDisabled ||
-        (!this.queryState.searchTerm && noResults)) {
+
+    if (queryState.queryingDisabled)
       return;
-    }
 
     this.set('queryState.querying', true);
     this.set('queryState.incremental', incremental);
 
     var lastVisitTime = 0;
     if (incremental) {
       var lastVisit = this.queryResult.results.slice(-1)[0];
       lastVisitTime = lastVisit ? Math.floor(lastVisit.time) : 0;
     }
 
@@ skipping 36 matching lines @@
       this.set('queryState.groupedOffset', changes.offset);
       needsUpdate = true;
     }
 
     if (changes.search != null &&
         changes.search != this.queryState.searchTerm) {
       this.set('queryState.searchTerm', changes.search);
       needsUpdate = true;
     }
 
-    if (needsUpdate)
+    if (needsUpdate) {
       this.queryHistory_(false);
+      if (this.router)
+        this.router.serializeUrl();
+    }
   },
 
   /**
    * @param {!Event} e
    * @private
    */
   onQueryHistory_: function(e) {
     this.queryHistory_(/** @type {boolean} */ e.detail);
     return false;
   },
 
   /** @private */
   searchTermChanged_: function() {
     // TODO(tsergeant): Ignore incremental searches in this metric.
     if (this.queryState.searchTerm)
       md_history.BrowserService.getInstance().recordAction('Search');
   },
 });