Change-Id: I8c930658fc875538952b21a59892264dad3186af
ORIGINAL_AUTHOR=Thai Duong <thaidn@google.com>

GitOrigin-RevId: 5d016e5ce6c41edf7204549bcd39fe3053d84f5c

automating generation of test rules for Java tests.

GenTestRules.bzl copied from
https://gist.github.com/jart/9a9f48e216fd747275012d2f2364ac09. I
modified to make it recognize src/java/test/ as a prefix (in addition to
javatests/ and java/).

Bazel developer explained why this is optimal:
https://groups.google.com/d/msg/bazel-discuss/MFYYkJk1tFs/xltlv4m_AQAJ.

Change-Id: I8ff9d48b994efa9e7ed7a1e2c7b8afed8a05b94a
ORIGINAL_AUTHOR=Thai Duong <thaidn@gmail.com>

GitOrigin-RevId: 9abc2685664a9f85ceca6835827219531ac8c6c6

Change-Id: I0377e32aea55c3e85a40bc64eddf45c52846cac6
ORIGINAL_AUTHOR=Bartosz Przydatek <przydatek@google.com>

GitOrigin-RevId: c80cbaaf25e74ab8a7595e5192628d0f5d993a4c

- Directory structure follows TensorFlow.
- Rules for protobuf building are based on https://github.com/pubref/rules_protobuf, as I can't find anything simpler.
- Continuous integration with Kokoro (work in progress).

I also copied some existing Java/CC code from Bartosz and Daniel's experimental folders.

Change-Id: I7f993934d149c114320e3388fee84fbdafd7ba81