Don't use native bridge for non zygote-spawn processes

... unless we force it for testing purposes.

Bug: 26954924
Change-Id: Ib4660a35175abb479d0399e18b6194eb04dbc248
diff --git a/test/115-native-bridge/run b/test/115-native-bridge/run
index ea2045b..aeb5721 100644
--- a/test/115-native-bridge/run
+++ b/test/115-native-bridge/run
@@ -28,4 +28,4 @@
 LEFT=$(echo ${ARGS} | sed -r 's/-Djava.library.path.*//')
 RIGHT=$(echo ${ARGS} | sed -r 's/.*Djava.library.path[^ ]* //')
 MODARGS="${LEFT} -Djava.library.path=`pwd` ${RIGHT}"
-exec ${RUN} --runtime-option -XX:NativeBridge=libnativebridgetest.so ${MODARGS} NativeBridgeMain
+exec ${RUN} --runtime-option -Xforce-nb-testing --runtime-option -XX:NativeBridge=libnativebridgetest.so ${MODARGS} NativeBridgeMain