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This change adds a missing check that a new serial port matches the
filter specified by the developer when it is detected after the chooser
UI is shown.

Matching tests are added to exercise this case.

Bug: 1130674
Change-Id: I3f7a5086b98971cafd69fe5e630500932944af98
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422431
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Vincent Scheib <scheib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809117}