[toolchain-utils] Add tryjob flags to build Chrome from 9999 ebuild.

This CL updates the nightly tryjobs to build Chrome using the
9999 ebuild, to work with the CL that updates Chrome to not use
ThinLTO caching, so we can test LLD with our nightly builders.

BUG=None
TEST=Tested a tryjob with those flags and that CL, and it worked.

Change-Id: I3b1e77de6d1ead54f1696dc49987a37dd8db50ad
Reviewed-on: https://chromium-review.googlesource.com/1345889
Commit-Ready: Caroline Tice <cmtice@chromium.org>
Tested-by: Caroline Tice <cmtice@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
1 file changed