GitLab

Custom color picker with following features:
 - keyboard navigation
 - preselect
 - updates color picker colors according to the generated theme
 - maintains the selected color while the dialog is open, even
   when other tiles are selected, but resets after dialog is closed.

screencast:
https://screencast.googleplex.com/cast/NjM3NTk3NTc5MTA5OTkwNHwxNjY5MDE1Mi1kYg

Bug: 988066
Change-Id: I4d1b6a1ecb0e4daf81806327f3b613a704a1df96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1723019
Commit-Queue: Gayane Petrosyan <gayane@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683045}