[MD Bookmarks] Add search.

chrome/browser/resources/md_bookmarks/folder_node.js

Index: chrome/browser/resources/md_bookmarks/folder_node.js
diff --git a/chrome/browser/resources/md_bookmarks/folder_node.js b/chrome/browser/resources/md_bookmarks/folder_node.js
index 6e9cce81e6c7d2133b98d5cfe5978ffad810f2aa..ff18da35b8a877e2bca5734e4a066da3693dbf82 100644
--- a/chrome/browser/resources/md_bookmarks/folder_node.js
+++ b/chrome/browser/resources/md_bookmarks/folder_node.js
@@ -14,6 +14,12 @@ Polymer({
       value: false,
       reflectToAttribute: true,
     },
+
+    sidebarActive: {

[tsergeant, 2017/01/06 02:43:54]

To avoid passing this all the way down the tree, is it possible to actually have
no node selected in the tree?

You'd just need to make sure the page recovers correctly when the search is
cleared.

This is kind of similar to what the old page does, and it goes back to selecting
'Bookmarks bar' when a search is cleared.

[angelayang, 2017/01/12 05:04:32]

Done.

+      type: Boolean,
+      value: true,
+      reflectToAttribute: true,
+    },
   },
 
   /**
@@ -21,7 +27,8 @@ Polymer({
    * @return {string}
    */
   getFolderIcon_: function() {
-    return this.isSelected ? 'bookmarks:folder-open' : 'bookmarks:folder';
+    return this.isSelected && this.sidebarActive ? 'bookmarks:folder-open' :
+                                                   'bookmarks:folder';
   },
 
   /**