The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d11d5998574a19fdc6d4d646c0dac32d4eb43888

commit d11d5998574a19fdc6d4d646c0dac32d4eb43888
Author: Megumi Hattori <megumihattori@google.com>
Date: Mon Apr 02 02:22:05 2018

Focus password prompt only when AUTH_PASSWORD is added as AuthMethods.

Before this CL, |password_view_| is always focused when
HasAuthMethod(AUTH_PASSWORD) is true.

This CL limits the timing of focusing |password_view_| to only when
HasAuthMethod(AUTH_PASSWORD) is changed from false to true.

This CL also fixes a bug that users cannot focus inline reply using
virtual keyboard on the lock screen.

BUG= 825781 
TEST=manual

Change-Id: I7afa75af0b3c86bf0988d5cbd95edc192255785a
Reviewed-on: https://chromium-review.googlesource.com/980272
Reviewed-by: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Megumi Hattori <megumihattori@google.com>
Cr-Commit-Position: refs/heads/master@{#547402}
[modify] https://crrev.com/d11d5998574a19fdc6d4d646c0dac32d4eb43888/ash/login/ui/login_auth_user_view.cc