GitLab

This change causes the user to be prompted to enable Bluetooth (if
necessary) after scanning a QR code. It also automatically enables
Bluetooth in order to process FCM messages in the background. The user
is advised of this when choosing to link with the device.

BUG=1002262

Change-Id: I918f12177597a49cd6fb2dc0d06bd2c4ba071c0b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538159
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#828472}