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This CL makes sure Picture-in-Picture window is always visible on all
workspaces by calling SetVisibleOnAllWorkspaces when it is shown.

Bug: 954470
Change-Id: If1f60781dd79cb8fb884cb41f3fe596e77fd9438
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1575598
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652736}