MD History: Refresh the list when clearing browsing data

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',
 
   behaviors: [HistoryListBehavior],
 
   properties: {
     // The search term for the current query. Set when the query returns.
     searchedTerm: {
       type: String,
       value: '',
     },
 
     lastSearchedTerm_: String,

[tsergeant, 2016/08/17 06:58:28]

This is no longer used and can be removed.

[lshang, 2016/08/18 08:41:54]

Done. Good catch!

 
     querying: Boolean,
 
+    clearingHistory_: {
+      type: Boolean,
+      value: false,
+    },
+
     // An array of history entries in reverse chronological order.
     historyData_: Array,
 
     resultLoadingDisabled_: {
       type: Boolean,
       value: false,
     },
   },
 
   listeners: {
@@ skipping 32 matching lines @@
    * Disables history result loading when there are no more history results.
    */
   disableResultLoading: function() {
     this.resultLoadingDisabled_ = true;
   },
 
   /**
    * Adds the newly updated history results into historyData_. Adds new fields
    * for each result.
    * @param {!Array<!HistoryEntry>} historyResults The new history results.
+   * @param {boolean} incremental Whether the result is from loading more
+   * history, or a new search/list reload.
+   * @param {number} selectedCount Number of selected items.
    */
-  addNewResults: function(historyResults) {
+  addNewResults: function(historyResults, incremental, selectedCount) {
     var results = historyResults.slice();
     /** @type {IronScrollThresholdElement} */(this.$['scroll-threshold'])
         .clearTriggers();
 
-    if (this.lastSearchedTerm_ != this.searchedTerm) {
+    // Do not reload the list when clearing browsing data and there are items
+    // checked.
+    if (this.clearingHistory_) {
+      this.clearingHistory_ = false;
+      if (selectedCount > 0)
+        return;
+    }
+
+    if (!incremental) {
       this.resultLoadingDisabled_ = false;
       if (this.historyData_)
         this.splice('historyData_', 0, this.historyData_.length);
       this.fire('unselect-all');
       this.lastSearchedTerm_ = this.searchedTerm;
     }
 
     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.
       this.set('historyData_', results);
     }
   },
 
+  clearingHistory: function() {
+    this.clearingHistory_ = true;
+  },
+
   /**
    * Called when the page is scrolled to near the bottom of the list.
    * @private
    */
   loadMoreData_: function() {
     if (this.resultLoadingDisabled_ || this.querying)
       return;
 
     this.fire('load-more-history');
   },
@@ skipping 62 matching lines @@
 
   /**
    * @param {number} index
    * @return {string}
    * @private
    */
   pathForItem_: function(index) {
     return 'historyData_.' + index;
   },
 });