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Android tells Chrome to activate windows through onTaskMovedToFront,
which is called by ActivityStack#moveTaskToFront. For PIP tasks,
we reparent them with reparent() and the function inserts them on
top without using moveTaskToFront, so we seem to activate them
explicitly.

confirmed the browser was properly activated.

Bug: b/123259430
Test: Exited PIP, pressed the shelf icon of the browser, and
Test: atest android.server.am.ActivityManagerPinnedStackTests
Change-Id: I7532e4b2c66a28b83168abcf3207266961c9a3a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1485625
Commit-Queue: Kazuki Takise <takise@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638501}