runfiles library: py_binary can run java_binary

Add "JAVA_RUNFILES" (and "RUNFILES_DIR") to the
dict that Runfiles.EnvVars() returns in the Python
runfiles library, so Python programs that use the
Python runfiles library in @bazel_tools can now
run java_binary data-dependencies as subprocesses
and the latter will find the runfiles.

See https://github.com/bazelbuild/bazel/issues/4460

Change-Id: I0566f6d3c68631a1d99e67964fbe8019ee82324b
PiperOrigin-RevId: 185812948
5 files changed
tree: 212abc71b053377f10c221e1695819cde19df6e3
  1. examples/
  2. scripts/
  3. site/
  4. src/
  5. third_party/
  6. tools/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. BUILD
  11. CHANGELOG.md
  12. combine_distfiles.py
  13. combine_distfiles_to_tar.sh
  14. compile.sh
  15. CONTRIBUTING.md
  16. CONTRIBUTORS
  17. ISSUE_TEMPLATE.md
  18. LICENSE
  19. README.md
  20. WORKSPACE
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