MD History: Refresh the list when clearing browsing data

chrome/browser/resources/md_history/history_list.js

Index: chrome/browser/resources/md_history/history_list.js
diff --git a/chrome/browser/resources/md_history/history_list.js b/chrome/browser/resources/md_history/history_list.js
index aaba6536622c5929aba6360e9ff38e4a8f659dfc..30c56aca28317562606f471a48f56f27abc09cfa 100644
--- a/chrome/browser/resources/md_history/history_list.js
+++ b/chrome/browser/resources/md_history/history_list.js
@@ -16,6 +16,11 @@ Polymer({
 
     querying: Boolean,
 
+    reloadingList_: {
+      type: Boolean,
+      value: false,
+    },
+
     // An array of history entries in reverse chronological order.
     historyData_: Array,
 
@@ -81,10 +86,23 @@ Polymer({
     }
 
     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);
+      // Reload the list when browsing data is cleared.
+      if (this.reloadingList_) {
+        this.reloadingList_ = false;
+        // If we have previously received data, refresh the list unless the user
+        // has any items checked.
+        var selectedItem = this.historyData_.filter(function(item) {

[tsergeant, 2016/08/08 05:05:12]

Chris has a CL in review which makes it much easier to determine whether items
are selected, and works for both normal history and grouped history.

It should make things nicer for this patch, do you mind waiting until Chris'
patch lands?

+          return item.selected;
+        });
+        if (selectedItem.length == 0) {
+          this.splice('historyData_', 0, this.historyData_.length);
+          this.set('historyData_', results);
+        }
+      } else {
+        // Infinite scrolling. 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.
@@ -92,6 +110,10 @@ Polymer({
     }
   },
 
+  reloadingList: function() {
+    this.reloadingList_ = true;
+  },
+
   /**
    * Cycle through each entry in historyData_ and set all items to be
    * unselected.