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

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

Index: chrome/browser/resources/bookmark_manager/js/main.js
diff --git a/chrome/browser/resources/bookmark_manager/js/main.js b/chrome/browser/resources/bookmark_manager/js/main.js
index 079bc8ebe4a2f9fe5ed7653e0808e0d4182665f8..7db191be87c4f6db689fc9c74026b2a8592405bc 100644
--- a/chrome/browser/resources/bookmark_manager/js/main.js
+++ b/chrome/browser/resources/bookmark_manager/js/main.js
@@ -239,6 +239,17 @@ function processHash() {
 
 // 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();
 }