libchrome: Export base/functional headers am: a78c30d256 am: 8ff21aa6e0 am: bd8fe4d975

Original change: https://android-review.googlesource.com/c/platform/external/libchrome/+/2424171

Change-Id: Ia33f1a593994cddc12349f7fdf81d26ca6c29eb7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>