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As Plugin VM can take a few seconds to start up, we should show a
spinner similar to ARC and Crostini. Subsequent launches in a session
tend to be slightly faster so we only show a spinner for the first
launch. A subsequent CL will make us also show a spinner if we have to
wait for the VM to finish shutting down or suspending before starting
it (which isn't yet implemented).

Bug: 940319
Change-Id: I9ef4078e21f15e4c926a2c23860de14095679f7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1634294Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Commit-Queue: Timothy Loh <timloh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#665060}