GitLab

Currently, the user can unlock their device using one of three methods:
  - their password,
  - a PIN or password,
  - no authentication.

The setup pin screen is in a dependent CL.

The choose-method screen is available from the /quickUnlock/chooseMethod
endpoint.

BUG=603217
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2097673002
Cr-Commit-Position: refs/heads/master@{#405249}