desktopui_ScreenLockerTelemetry implementation

This test uses chrome.autotestPrivate.lockScreen() to lock the screen.
It uses Oobe.authenticateForTesting() to unlock the screen, attempting both
bad and correct passwords. It verifies that the screenlock screen appears as
expected.

BUG=chromium:233834
TEST=This is the test.

Change-Id: I9439ee9bb3a96b4f5cccdb47d15957a8338ed6e8
Reviewed-on: https://chromium-review.googlesource.com/172762
Reviewed-by: Simran Basi <sbasi@chromium.org>
Commit-Queue: Achuith Bhandarkar <achuith@chromium.org>
Tested-by: Achuith Bhandarkar <achuith@chromium.org>
2 files changed