GitLab

This changes FakePowerManagerClient to allow setting specific fake
battery values per device so that tests can be more controlled. Without
this, all devices will trigger PeripheralBatteryStatusReceived events
that are often unwanted in tests.

BUG=b:166530001

Change-Id: I74ee52685a955a0996b0aef72da403ae9ea79d51
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410961
Commit-Queue: Sonny Sasaka <sonnysasaka@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807131}