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This CL implements the new GM2 styles for the non-
client frames caption buttons:
- Use circular inkdrop flood fill and highlight.
- Use the new colors and opacities for the caption icons.
- Use a height of 32dp for the non-browser frames.

TODO: Implement the same styles for PWAs' frame buttons

BUG=831872
TEST=manual

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Id2c2603b67b290b5eba1970d78d5d0c395df7fe4
Reviewed-on: https://chromium-review.googlesource.com/1041144
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555864}