proto: Add battery_state to track health of battery

BUG=b:163572001
TEST=None

Change-Id: I545950797b43c40a6897de89d3d96016f6e68f39
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2719446
Auto-Submit: Otabek Kasimov <otabek@google.com>
Reviewed-by: Xixuan Wu <xixuan@chromium.org>
Commit-Queue: Otabek Kasimov <otabek@google.com>
2 files changed