Adds a simple hover effect to default buttons to improve hover response.

Tiny CL that temporarily patches buttons so that they respond to the
':hover' pseudo class (which is added during cursor hover).

It adds the 'button:hover' selector to a preexisting CSS rule that
controlled the hover styles for flat buttons.

This will need a follow up CL to improve the animation and the hover
style for '.suggested-action'.

Bug: 822495
Change-Id: I5fa1a266dc40aaa862fa5fd83a1d40c37f89297c
Reviewed-on: https://chromium-review.googlesource.com/1141552
Commit-Ready: Josh Pratt <jopra@chromium.org>
Tested-by: Josh Pratt <jopra@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
2 files changed