MD History: add shortcuts for search

chrome/browser/resources/md_history/history_toolbar.js

Index: chrome/browser/resources/md_history/history_toolbar.js
diff --git a/chrome/browser/resources/md_history/history_toolbar.js b/chrome/browser/resources/md_history/history_toolbar.js
index 13f9c35d6c704424fc288305e4f4d533a484c1ca..710861e7568c25fa54f1b31ff74f9422cc25ff73 100644
--- a/chrome/browser/resources/md_history/history_toolbar.js
+++ b/chrome/browser/resources/md_history/history_toolbar.js
@@ -96,6 +96,10 @@ Polymer({
     this.fire('delete-selected');
   },
 
+  onFindCommand: function() {

[tsergeant, 2016/07/05 07:47:22]

Since there's nothing about this function that ties it directly to the find
command, you could name it something more generic like "showSearchField".

[lshang, 2016/07/06 05:03:08]

Done.

+    this.$['main-toolbar'].$['search'].showAndFocus();

[tsergeant, 2016/07/05 07:47:22]

Use

this.$['main-toolbar'].getSearchField().showAndFocus();

as above in setSearchTerm();

Outside of tests, try to avoid nesting use of $[], since you end up depending on
the internal structure of other elements.

[lshang, 2016/07/06 05:03:08]

Done. Good point!

+  },
+
   /**
    * If the user is a supervised user the delete button is not shown.
    * @private