Add plumbing to pass remoteexec info.

BUG=chromium:1256966
TEST=run_tests

Change-Id: I98b614cd0aab6fd2a84b649fa970a7112047580d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3290681
Tested-by: Joanna Wang <jojwang@chromium.org>
Commit-Queue: Joanna Wang <jojwang@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
diff --git a/api/controller/sysroot_unittest.py b/api/controller/sysroot_unittest.py
index b1bd4e0..fba510e 100644
--- a/api/controller/sysroot_unittest.py
+++ b/api/controller/sysroot_unittest.py
@@ -612,6 +612,7 @@
         ],
         use_flags=[],
         use_goma=False,
+        use_remoteexec=False,
         incremental_build=False,
         setup_board=False,
         dryrun=False)