Rewrite some parts of the titlebar styles to better match Chrome OS

This changes how background-images are applied the the titlebar's
titlebuttons and resizes the titlebuttons to more closely match Chrome
OS.

Bug: 822495
Change-Id: I570aad608b4d97e07d180678f4f69682b2e07ef4
Reviewed-on: https://chromium-review.googlesource.com/1124133
Commit-Ready: Josh Pratt <jopra@chromium.org>
Tested-by: Josh Pratt <jopra@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
1 file changed