The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/52c142c66e2dbe14cd5c1c98222e3b1a22459979

commit 52c142c66e2dbe14cd5c1c98222e3b1a22459979
Author: Tim Song <tengs@chromium.org>
Date: Thu Jul 20 03:29:07 2017

[EasyUnlock] Enable EasyUnlock v2 (BLE) by default.

BUG= 741214 

Change-Id: I2184b489044fc07de51ca3abbe4d5a5836138411
Reviewed-on: https://chromium-review.googlesource.com/567244
Commit-Queue: Tim Song <tengs@chromium.org>
Reviewed-by: Gustavo Sacomoto <sacomoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488124}
[modify] https://crrev.com/52c142c66e2dbe14cd5c1c98222e3b1a22459979/chrome/browser/about_flags.cc
[modify] https://crrev.com/52c142c66e2dbe14cd5c1c98222e3b1a22459979/chrome/browser/chromeos/login/easy_unlock/bootstrap_browsertest.cc
[modify] https://crrev.com/52c142c66e2dbe14cd5c1c98222e3b1a22459979/chrome/browser/extensions/api/easy_unlock_private/easy_unlock_private_api.cc
[modify] https://crrev.com/52c142c66e2dbe14cd5c1c98222e3b1a22459979/chrome/browser/extensions/api/easy_unlock_private/easy_unlock_private_api_chromeos_unittest.cc
[modify] https://crrev.com/52c142c66e2dbe14cd5c1c98222e3b1a22459979/chrome/browser/flag_descriptions.cc
[modify] https://crrev.com/52c142c66e2dbe14cd5c1c98222e3b1a22459979/chrome/browser/signin/easy_unlock_auth_attempt.cc
[modify] https://crrev.com/52c142c66e2dbe14cd5c1c98222e3b1a22459979/chrome/browser/signin/easy_unlock_auth_attempt_unittest.cc
[modify] https://crrev.com/52c142c66e2dbe14cd5c1c98222e3b1a22459979/chrome/browser/signin/easy_unlock_service.cc
[modify] https://crrev.com/52c142c66e2dbe14cd5c1c98222e3b1a22459979/chrome/browser/signin/easy_unlock_service_regular.cc
[modify] https://crrev.com/52c142c66e2dbe14cd5c1c98222e3b1a22459979/chrome/browser/signin/easy_unlock_service_signin_chromeos.cc
[modify] https://crrev.com/52c142c66e2dbe14cd5c1c98222e3b1a22459979/components/proximity_auth/remote_device_life_cycle_impl.cc
[modify] https://crrev.com/52c142c66e2dbe14cd5c1c98222e3b1a22459979/components/proximity_auth/switches.cc
[modify] https://crrev.com/52c142c66e2dbe14cd5c1c98222e3b1a22459979/components/proximity_auth/switches.h
[modify] https://crrev.com/52c142c66e2dbe14cd5c1c98222e3b1a22459979/tools/metrics/histograms/enums.xml