Change getBadgedLabelForUser to use CharSequence

Bug: 16401636
Change-Id: I7b72a6dd53fec1c0afe6ea33803af9e3c54e597e
diff --git a/src/com/android/launcher3/ItemInfo.java b/src/com/android/launcher3/ItemInfo.java
index fe03017..c726fb4 100644
--- a/src/com/android/launcher3/ItemInfo.java
+++ b/src/com/android/launcher3/ItemInfo.java
@@ -110,7 +110,7 @@
     /**
      * Content description of the item.
      */
-    String contentDescription;
+    CharSequence contentDescription;
 
     /**
      * The position of the item in a drag-and-drop operation.