Add hidden method to access a connection's service.

This change exposes a method that is used by the actual
fix here: I4e4789c044d9e3614f42143cfa6053881a6d109b

Bug: 17962996
Change-Id: Iec3795ea372634120c71b0a80ee046e372569ecf
diff --git a/telecomm/java/android/telecom/Connection.java b/telecomm/java/android/telecom/Connection.java
index b5f6692..4c1f75f 100644
--- a/telecomm/java/android/telecom/Connection.java
+++ b/telecomm/java/android/telecom/Connection.java
@@ -901,6 +901,13 @@
     }
 
     /**
+     * @hide
+     */
+    public final ConnectionService getConnectionService() {
+        return mConnectionService;
+    }
+
+    /**
      * Sets the conference that this connection is a part of. This will fail if the connection is
      * already part of a conference call. {@link #resetConference} to un-set the conference first.
      *