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Calls SetAppIdForWindow() in OverlayWindowViews::Create, using the
appid of the web contents window that opened the Pip Window. This makes
the Pip window get grouped with the window the Pip window was opened
from on the Windows taskbar.

Bug: 1116776
Change-Id: I23bb2cb8770c1778817a09139cb778f2b2e5549e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2388274
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805336}