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The profile color will be used by different screens (Sign in promo,
local profile customization, may be sync promo) that belong to the
profile creation flow. This CL provides the pipeline to request the new
profile color from native and passing it to the sign in promo component.
A smarter profile color picking will be implemented in the future.

Bug: 1063856
Change-Id: I7f066656897ff1da6292414bba53e34613368dec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2310671
Commit-Queue: Monica Basta <msalama@chromium.org>
Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791756}