Add utility to get voicemail uri

Change-Id: I7016a85e23dbed6d4b850244ea14c311e265e02b
diff --git a/src/com/android/contacts/common/CallUtil.java b/src/com/android/contacts/common/CallUtil.java
index a5587ca..1b998b5 100644
--- a/src/com/android/contacts/common/CallUtil.java
+++ b/src/com/android/contacts/common/CallUtil.java
@@ -94,6 +94,13 @@
     }
 
     /**
+     * @return Uri that directly dials a user's voicemail inbox.
+     */
+    public static Uri getVoicemailUri() {
+        return Uri.fromParts(PhoneAccount.SCHEME_VOICEMAIL, "", null);
+    }
+
+    /**
      * Determines if one of the call capable phone accounts defined supports video calling.
      *
      * @param context The context.