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Allows the margin allowed for the bottom system gesture to be
specified separately from the top.

Bug: internal b/111304882
Test: manual
Change-Id: Ie549f2b7d48a4533eb5f493ed9255cf6ef6898d1
Reviewed-on: https://chromium-review.googlesource.com/1138395Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Commit-Queue: Alex Sakhartchouk <alexst@chromium.org>
Commit-Queue: Ryan Daum <rdaum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575289}