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Create a class that listens to PowerManagerClient for changes in the
battery level of Bluetooth HID devices, and update the corresponding
device::BluetoothDevice battery percentage field.

Design doc at go/cros-bt-battery.

Bug: 785758
Change-Id: I3519d6d19c7a24abafc353d4afd3d059034e808b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1721087
Commit-Queue: Alberto Herrera <ahrfgb@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683295}