GitLab

This was already happening on tablet mode. Ux said it is ok to match
the two now. Also change some values for the header fade in animation.

Test: manual
Bug: 829292
Change-Id: I428081f0d19d1b8508e8576f5ea8a36e75843e6b
Reviewed-on: https://chromium-review.googlesource.com/1164534Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581613}