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when menu is already shown.

- Don't dismiss the menu if pressing power button when menu is already shown.
  Wait for 650ms to start the pre-shutdown animation and request focus for
  'power off' item instead.

- Turn screen off for convertible device / in tablet mode if
  "ModeSpecificPowerButton" is set when menu is not fully shown or second
   press before starting the pre-shutdown animation.

Test=PowerButtonControllerTest*

Bug: 826057
Change-Id: I1f906e2bcf5d91960180742bf558c00784fbaa1e
Reviewed-on: https://chromium-review.googlesource.com/1011590
Commit-Queue: Min Chen <minch@chromium.org>
Reviewed-by: Qiang Xu <warx@google.com>
Reviewed-by: Dan Erat <derat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550785}