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This CL adds support for the eye dropper on Mac by using NSColorSampler.
This approach avoids the security dialog asking for more permissions.

Bug: 992297
Change-Id: Ia70d6c4daf3ec678e558ca528b63bfe960363f0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378773Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Ionel Popescu <iopopesc@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#802457}