"ctrl + double click" acts on the highlighted/selected bookmark list items irrespective of on which…

chrome/browser/resources/bookmark_manager/js/main.js

 // Copyright (c) 2012 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.
 
 (function() {
 /** @const */ var BookmarkList = bmm.BookmarkList;
 /** @const */ var BookmarkTree = bmm.BookmarkTree;
 /** @const */ var Command = cr.ui.Command;
 /** @const */ var CommandBinding = cr.ui.CommandBinding;
 /** @const */ var LinkKind = cr.LinkKind;
@@ skipping 221 matching lines @@
     // We need to verify that this is a correct ID.
     chrome.bookmarks.get(id, function(items) {
       if (items && items.length == 1)
         updateParentId(id);
     });
   }
 }
 
 // Activate is handled by the open-in-same-window-command.
 function handleDoubleClickForList(e) {
+  var target = e.target;
+  target = list.getListItemAncestor(target);
+  var index = -1;

[yosin_UTC9, 2014/09/01 01:04:54]

nit: "?" makes shorter:
var index = target ? list.getIndexOfListItem(target) : -1

+  if (target)
+    index = list.getIndexOfListItem(target);
+
+  var sm = list.selectionModel;
+  var indexSelected = sm.getIndexSelected(index);
+  if (!indexSelected)
+    list.handlePointerDownUp_(e);
+
   if (e.button == 0)
     $('open-in-same-window-command').execute();
 }
 
 // The list dispatches an event when the user clicks on the URL or the Show in
 // folder part.
 function handleUrlClickedForList(e) {
   getLinkController().openUrlFromEvent(e.url, e.originalEvent);
   chrome.bookmarkManagerPrivate.recordLaunch();
 }
@@ skipping 1117 matching lines @@
 
   cr.ui.FocusOutlineManager.forDocument(document);
   initializeSplitter();
   bmm.addBookmarkModelListeners();
   dnd.init(selectItemsAfterUserAction);
   tree.reload();
 }
 
 initializeBookmarkManager();
 })();