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This CL sets the different margins and paddings such that the bottom bar
has a fixed size most of the time.

Change-Id: I2bcd51c0badcb7d09f029fc823f7eb725c167978
Reviewed-on: https://chromium-review.googlesource.com/c/1319671
Commit-Queue: Jordan Demeulenaere <jdemeulenaere@chromium.org>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606507}