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Anonymous apps are generated when borealis identifies a window with an
app_id it does not recognize.

In this CL we add the logic to remove those anonymous apps. When all the
windows close associated with that anonymous app, we say the app is
"finished", allowing observers to clean it up.

Bug: b/172979315
Change-Id: I5c1c0cfd2ed15fcd35474c53011cbce6c0733d51
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2562624
Commit-Queue: Nic Hollingum <hollingum@google.com>
Reviewed-by: Daniel Ng <danielng@google.com>
Reviewed-by: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833553}