Profile Avatar Selector: Allow arrow keys to be used for moving between avatars (2nd edition)

ui/webui/resources/cr_elements/cr_profile_avatar_selector/cr_profile_avatar_selector_listbox.js

Index: ui/webui/resources/cr_elements/cr_profile_avatar_selector/cr_profile_avatar_selector_listbox.js
diff --git a/ui/webui/resources/cr_elements/cr_profile_avatar_selector/cr_profile_avatar_selector_listbox.js b/ui/webui/resources/cr_elements/cr_profile_avatar_selector/cr_profile_avatar_selector_listbox.js
new file mode 100644
index 0000000000000000000000000000000000000000..3a1e3cc47bebdb2711baba89cf487d1606614d70
--- /dev/null
+++ b/ui/webui/resources/cr_elements/cr_profile_avatar_selector/cr_profile_avatar_selector_listbox.js
@@ -0,0 +1,27 @@
+// Copyright 2016 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.
+
+/**
+ * @fileoverview 'cr-profile-avatar-selector-listbox' is an accessible listbox
+ * control for profile avatar icons that allows keyboard navigation with all
+ * four arrow keys.
+ */
+
+(function() {
+  Polymer({
+    is: 'cr-profile-avatar-selector-listbox',
+
+    behaviors: [
+      // Note the order here. We want _onUpKey and _onDownKey key binding
+      // callbacks of Polymer.IronMenubarBehavior to be overridden by those of
+      // Polymer.IronMenuBehavior.

[Dan Beam, 2016/09/15 16:42:04]

ehhhhhh, depending on order is kinda lame

+      Polymer.IronMenubarBehavior,

[Dan Beam, 2016/09/15 17:47:02]

can we just just NOT use the full IronMenubarBehavior?  and just copy the parts
that aren't silly for our use case?

+      Polymer.IronMenuBehavior,
+    ],
+
+    hostAttributes: {
+      role: 'listbox'
+    }
+  });
+})();