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This CL adds support for PIP (Picture in Picture) window state when
querying ARC window state via autotest_private_api.

This is needed because we are replacing "dumpsys" with "dumpsys --proto"
and "dumpsys --proto" does include the PIP state.
And besides that, it is better to query Ash, than Android, for ARC
states.

TEST=Calling "ash.GetARCAppWindowState" from Tast returns PIP on PIP ARC
     windows.
BUG=chromium:1000774

Change-Id: I4096ab205836f3f3f8b1d4eb964321dd62df77dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1785058Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Ricardo Quesada <ricardoq@chromium.org>
Auto-Submit: Ricardo Quesada <ricardoq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693345}