add vanilla_image option to build_chromeos.py
This adds vanilla_iamge option to build_chromeos.py.
With this option, it runs build_packages with --usepkg.
In the test_toolchains.py, it uses this option when
building vanilla image.
BUG=None
TEST=None
Change-Id: I54f85e60ccae833ab6682476e19365a51df5ef29
Reviewed-on: https://gerrit-int.chromium.org/43088
Reviewed-by: Luis Lozano <llozano@chromium.org>
Commit-Queue: Yunlian Jiang <yunlian@google.com>
Tested-by: Yunlian Jiang <yunlian@google.com>
2 files changed
