Add GetToolchainPaths service endpoint

BUG=b:147234405
TEST=generate.sh

Change-Id: I1860f39019e5bd670b694e75242982b76a8fab19
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/1988524
Commit-Queue: Chris McDonald <cjmcdonald@chromium.org>
Tested-by: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
3 files changed