Implement SID API

Change-Id: Id11632a6b4b9cab6f08f97026dd65fdf49a46491
diff --git a/gatekeeperd/IGateKeeperService.cpp b/gatekeeperd/IGateKeeperService.cpp
index b1e4811..d4ed533 100644
--- a/gatekeeperd/IGateKeeperService.cpp
+++ b/gatekeeperd/IGateKeeperService.cpp
@@ -115,6 +115,14 @@
             }
             return NO_ERROR;
         }
+        case GET_SECURE_USER_ID: {
+            CHECK_INTERFACE(IGateKeeperService, data, reply);
+            uint32_t uid = data.readInt32();
+            uint64_t sid = getSecureUserId(uid);
+            reply->writeNoException();
+            reply->writeInt64(sid);
+            return NO_ERROR;
+        }
         default:
             return BBinder::onTransact(code, data, reply, flags);
     }