6a0ca8dc7 Let java unit tests build with autoninja (flutter/engine#11799) (#39599)

git@github.com:flutter/engine.git/compare/740f9160a256...6a0ca8dc7890

git log 740f9160a256..6a0ca8dc7890 --no-merges --oneline
2019-08-31 xster@google.com Let java unit tests build with autoninja (flutter/engine#11799)


If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/flutter-engine-flutter-autoroll
Please CC garyq@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

bin/internal/engine.version

-740f9160a256c700496b04e43c38d398cb7a9963
+6a0ca8dc7890b681ba159d3ea36760fcda6d9bf3