eclass: pulled Bazel eclass from upstream.

In future, there will be more / more complex Bazel projects in
Chrome OS. We pull Gentoo's Bazel eclass to make ebuilds
simpler for those projects.

BUG=chromium:955950
TEST=None
CQ-DEPEND=CL:1580568

Change-Id: I8550ac3168c5cecbe1f0d3e3c0af23d82c87bfa8
Reviewed-on: https://chromium-review.googlesource.com/1580569
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Michael Martis <martis@chromium.org>
Reviewed-by: Andrew Moylan <amoylan@chromium.org>
1 file changed