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This repros by

  - Open login or lock screen, enter tablet mode
  - Type password using VK
  - Dismiss VK
  - Hit the submit button on the password field

You can also submit by hitting 'enter' on the VK

Bug: 892270
Change-Id: I39b40c6710a3ddca22cd110255f05014a9134798
Reviewed-on: https://chromium-review.googlesource.com/c/1287177Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601306}