Add icon-visibility attribute to cr.ui.Tree.

chrome/browser/resources/shared/js/cr/ui/tree.js

Index: chrome/browser/resources/shared/js/cr/ui/tree.js
diff --git a/chrome/browser/resources/shared/js/cr/ui/tree.js b/chrome/browser/resources/shared/js/cr/ui/tree.js
index c1386358ec03028830dca7367e17279597342881..7d3196e2d64dfa3a51ed8155681eb57d7411d043 100644
--- a/chrome/browser/resources/shared/js/cr/ui/tree.js
+++ b/chrome/browser/resources/shared/js/cr/ui/tree.js
@@ -218,6 +218,16 @@ cr.define('cr.ui', function() {
   };
 
   /**
+   * Determines the visibility of icons next to the treeItem labels. If set to
+   * 'hidden', no space is reserved for icons and no icons are displayed next
+   * to treeItem labels. If set to 'parent', folder icons will be displayed
+   * next to expandable parent nodes. If set to 'all' folder icons will be
+   * displayed next to all nodes. Icons can be set using the treeItem's icon
+   * property.
+   */
+  cr.defineProperty(Tree, 'iconVisibility', cr.PropertyKind.ATTR);

[arv (Not doing code reviews), 2011/10/31 18:44:54]

Sorry this will not work. We need to translate the name.

We would need to update defineProperty to allow passing dash-separated-words and
then convert those to camelCase for the property. Another option could be to
pass an array of the two names instead. This would be more flexible since it
could allow cases like ['tabIndex', 'tabindex'] to work.

http://www.google.com/codesearch#OAMlx_jo-ck/src/chrome/browser/resources/sha...

[flackr, 2011/11/01 17:06:14]

Have a look, I think this should work.

+
+  /**
    * This is used as a blueprint for new tree item elements.
    * @type {!HTMLElement}
    */