libchrome: alias base::Optional to absl::optional Cherry-pick of crrev.com/c/2892208. For migrating to absl::optional in other packages. BUG=b:190446478 TEST=./build_packages --board=hatch TEST=CQ Change-Id: Ia6be3e8edb02ac6a95a4d7370165945ac35ad183 Reviewed-on: https://chromium-review.googlesource.com/c/aosp/platform/external/libchrome/+/2966213 Reviewed-by: Qijiang Fan <[email protected]> Commit-Queue: Grace Cham <[email protected]> Tested-by: Grace Cham <[email protected]>
This directory includes the source from Chrome's libbase for use in Chrome OS.
See libchrome.md for more info.