CI fails on test_android

[gengjiawen]

Looks like miss some buck dependency

+ buck fetch ReactAndroid/src/androidTest/...
2018-09-22 04:23:22,325 [WARNING][buck_tool.py:450] Not using buckd because watchman isn't installed.
Picked up _JAVA_OPTIONS: -XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap
PARSING BUCK FILES... 0.0s (100%)
No build file at ReactAndroid/src/main/java/com/facebook/fbreact/fabricxx/BUCK when resolving target //ReactAndroid/src/main/java/com/facebook/fbreact/fabricxx:fabricxx.

This error happened while trying to get dependency '//ReactAndroid/src/main/java/com/facebook/fbreact/fabricxx:fabricxx' of target '//ReactAndroid/src/androidTest/java/com/facebook/react/testing:testing'
Exited with code 1

[hramos]

Sorry for the trouble with the bot. I've added you to the core contributor white list which should prevent it from closing your issues automatically.