gtest: Support dependency metadata

Support the new test bed dependency metadata generation

BUG=None
TEST=Verified proto generation of chromeos-config-tools, unittest

Change-Id: I478c37a797e4bbf44a130942b8b589daaf74e223
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/3773730
Tested-by: Jesse McGuire <jessemcguire@google.com>
Reviewed-by: Derek Beckett <dbeckett@chromium.org>
Commit-Queue: Jesse McGuire <jessemcguire@google.com>
4 files changed