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This change adds getSignals() and setSignals() methods to the SerialPort
interface which call the existing GetControlSignals() and
SetControlSignals() Mojo methods.

Bug: 884928
Change-Id: I5aace2e5fbd5ccad0c5b88a588ddd3de3f1a30d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1747979
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Cr-Commit-Position: refs/heads/master@{#687380}