power: Add stub implementation of PowerSupply.
To enable a later change to clean up some
dark-resume-related tests, add a PowerSupplyInterface class
and a PowerSupplyStub implementation of it.
BUG=chromium:384488
TEST=existing tests pass
Change-Id: Ia0d601208d38e8352f40fa02f5200c0a2620cb82
Reviewed-on: https://chromium-review.googlesource.com/205154
Tested-by: Daniel Erat <derat@chromium.org>
Reviewed-by: Sameer Nanda <snanda@chromium.org>
Commit-Queue: Daniel Erat <derat@chromium.org>
11 files changed