Fix file manager labels and aria role.

ui/file_manager/file_manager/foreground/js/ui/directory_tree.js

Index: ui/file_manager/file_manager/foreground/js/ui/directory_tree.js
diff --git a/ui/file_manager/file_manager/foreground/js/ui/directory_tree.js b/ui/file_manager/file_manager/foreground/js/ui/directory_tree.js
index cfb4b1e84e91bd435db1a8d12604b13dc4bb6a59..317e9792f231a8a172f92aa5799c7fc804d002e9 100644
--- a/ui/file_manager/file_manager/foreground/js/ui/directory_tree.js
+++ b/ui/file_manager/file_manager/foreground/js/ui/directory_tree.js
@@ -28,7 +28,7 @@ DirectoryItemTreeBaseMethods.getItemByEntry = function(entry) {
       // The Drive root volume item "Google Drive" and its child "My Drive" have
       // the same entry. When we look for a tree item of Drive's root directory,
       // "My Drive" should be returned, as we use "Google Drive" for grouping
-      // "My Drive", "Shared with me", "Recent", and "Offine".
+      // "My Drive", "Shared with me", "Recent", and "Offline".
       // Therefore, we have to skip "Google Drive" here.
       if (item instanceof DriveVolumeItem)
         return item.getItemByEntry(entry);
@@ -122,6 +122,8 @@ function DirectoryItem(label, tree) {
   item.hasChildren = false;
 
   item.label = label;
+  item.setAttribute('aria-label', label);

[yawano, 2016/07/27 01:22:08]

Should we use aria-labelledby since the label is visible in the UI? -
https://www.w3.org/TR/wai-aria/states_and_properties#aria-labelledby

[David Tseng, 2016/08/08 21:32:02]

I was poking around this file awhile ago before this change and iirc, the issue
was the label nodes need to have a unique id for us to use aria-labelledby --
complicating the change.

I don't think we need it for this case.

[yawano, 2016/08/12 00:46:43]

Acknowledged.

+
   return item;
 }