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A potential solution for issue 1119497 is to switch from enumerating
devices implementing GUID_DEVINTERFACE_COMPORT to using the "bus
enumerator" identified by GUID_DEVINTERFACE_SERENUM_BUS_ENUMERATOR.

I'm putting this behind a flag so that developers can try it out in
canary-channel. If it works I can enable it by default and keep the flag
around for a couple releases in case it causes other problems.

Bug: 1119497
Change-Id: Icad9008799ed331c3da15e5a70e0184144c47a58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2417460
Commit-Queue: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808368}