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This patch adds code to explicitly send a wink command to U2F devices
whenever an operation requires a test of user presence. This needs to be
sent for older devices that will not blink on their own.

Bug: 990456
Change-Id: Ia44d0e139f4946742514eb6bf3484d13aa501b5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1746630
Commit-Queue: Nina Satragno <nsatragno@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#686600}