The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/chromite/+/dc1f51051cf86794c9aef6f2b9a9728902b796e4

commit dc1f51051cf86794c9aef6f2b9a9728902b796e4
Author: Yunlian Jiang <yunlian@google.com>
Date: Fri Sep 28 02:45:15 2018

cros_chrome_sdk: add options to enable thinlto and cfi

This adds option '--thinlto' and '--cfi' to enable use_thin_lto
and use_cfi in simplechrome workflow.

BUG= chromium:889603 
TEST=cros chrome-sdk --board kevin --thinlto, use_thin_lto is set
     in gn file.

Change-Id: Ife5e05e9f432da7cc9266c0a85bcec221bd9a535
Reviewed-on: https://chromium-review.googlesource.com/1246964
Commit-Ready: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Caroline Tice <cmtice@chromium.org>
Reviewed-by: Luis Lozano <llozano@chromium.org>

[modify] https://crrev.com/dc1f51051cf86794c9aef6f2b9a9728902b796e4/cli/cros/cros_chrome_sdk.py