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This change enhances the abort() and close() methods on the writable
attribute of a SerialPort object so that it is possible to request
either a flush[1] (discarding buffered data) or drain[2] (waiting until
buffered data has been transmitted).

[1]: https://reillyeon.github.io/serial/#serialportsinkabortalgorithm-port
[2]: https://reillyeon.github.io/serial/#serialportsinkclosealgorithm-port

Bug: 989653, 989656
Change-Id: I95226e6f3069214b483935abdf4ae1e87d5961a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2277074
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789724}