libweave: Added base/ files required by libweave

These files cloned from
https://android.googlesource.com/platform/external/libchrome/+/3ca9d0096f5618f5bbad8b1363a069d13fc3026e

They are unchanged and not included into build yet.

BUG=brillo:1256
TEST=`FEATURES=test emerge-gizmo libweave buffet`

Change-Id: I91ccf741ffa3f8fc09f83ae7f6adfa279845434c

111

Change-Id: I27ef0b115216f9fd9865abecaf9e63749ec7a35c
Reviewed-on: https://chromium-review.googlesource.com/294331
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Tested-by: Vitaly Buka <vitalybuka@chromium.org>