personalization: add color selector to customization dialog

Displays the color options for each zone in the pop up view. When a user
selects a zone, corresponding color will be highlighted. If another
color is selected for a zone, updates the zone color for that zone.
http://go/scrcast/NDg2OTQ4MzI0MDg4MjE3NnxmNmE5NzY3Zi1jOQ

BUG=b:265855838, b:269137429, b:265855854
TEST=browser_tests --gtest_filter='*KeyboardBacklight*'
TEST=browser_tests --gtest_filter='*ZoneCustomization*'
TEST=unit_tests --gtest_filter='*KeyboardBacklight*'

Change-Id: Idf168ce7bd7d2d8cf2c6121e68ef84d318875355
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4307552


Reviewed-by: Jason Thai <jasontt@chromium.org>
Reviewed-by: David Padlipsky <dpad@google.com>
Commit-Queue: Thuong Phan <thuongphan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1118949}