Hidding Public Variable

Hidding Public Variable .

Change-Id: I3507ea73118e97c3514135b14dafb92a30a2ba9d
diff --git a/telecomm/java/android/telecom/PhoneAccount.java b/telecomm/java/android/telecom/PhoneAccount.java
index 1d6d8bc..4fd62e9 100644
--- a/telecomm/java/android/telecom/PhoneAccount.java
+++ b/telecomm/java/android/telecom/PhoneAccount.java
@@ -108,6 +108,11 @@
      */
     public static final String SCHEME_SIP = "sip";
 
+    /**
+     * {@hide}
+     */
+    public static final String SCHEME_SMSTO = "smsto";
+
     private final PhoneAccountHandle mAccountHandle;
     private final Uri mAddress;
     private final Uri mSubscriptionAddress;