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This CL adds ash window type (WindowStateType::PIP) to Chrome PIP window
only in Chrome OS.

This window type is used for distinguish PIP windows and manages them in
Chrome OS ash shell.

Bug: b/112060145
Change-Id: I9fb51e50577b8ebe9d690b6c2d83e300951d9846
Reviewed-on: https://chromium-review.googlesource.com/c/1242726
Commit-Queue: Yoshiki Iguchi <yoshiki@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Eliot Courtney <edcourtney@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604494}