MD History: Reset scroll position when displaying new results

chrome/browser/resources/md_history/history_list.js

 // Copyright 2015 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-list',
 
   properties: {
     // The search term for the current query. Set when the query returns.
     searchedTerm: {
@@ skipping 94 matching lines @@
   addNewResults: function(historyResults, incremental, finished) {
     var results = historyResults.slice();
     /** @type {IronScrollThresholdElement} */ (this.$['scroll-threshold'])
         .clearTriggers();
 
     if (!incremental) {
       this.resultLoadingDisabled_ = false;
       if (this.historyData_)
         this.splice('historyData_', 0, this.historyData_.length);
       this.fire('unselect-all');
+      this.scrollTop = 0;
     }
 
     if (this.historyData_) {
       // If we have previously received data, push the new items onto the
       // existing array.
       results.unshift('historyData_');
       this.push.apply(this, results);
     } else {
       // The first time we receive data, use set() to ensure the iron-list is
       // initialized correctly.
@@ skipping 359 matching lines @@
       results[i].selected = false;
       results[i].readableTimestamp =
           info.term == '' ? results[i].dateTimeOfDay : results[i].dateShort;
 
       if (results[i].dateRelativeDay != currentDate) {
         currentDate = results[i].dateRelativeDay;
       }
     }
   },
 });