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This cl changes the accessibility button on the marketing opt in screen
to only show up when the gesture navigation screen was shown. This cl
adds a function, was_shown(), to the gesture screen. This function can
be called to check whether the the gesture screen was shown or skipped
over.

Bug: 1068686
Change-Id: I2f7808806bd795cc43c62ada40a9e3f830da8e3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2142148
Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758944}