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Also added new content layer type for sliders to bring slider colors in
line with ux specs.

Bug: 960118
Change-Id: I5be99cb731ba77c3d32550a34d55bb5c4e8a5e5a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2024327
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736655}