message: Add BUILD files for the java generator.
diff: @@ -186,6 +186,17 @@ py_library(
  ],
  )
  +py_binary(
  + name = "build_java_api_docs",
  + srcs = ["build_java_api_docs.py"],
  + python_version = "PY3",
  + srcs_version = "PY3",
  + deps = [
  + "@absl_py//absl:app",
  + "@absl_py//absl/flags",
  + ],
  +)
  +
  py_library(
  name = "py_guide_parser",
  srcs = ["py_guide_parser.py"],
  