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This cl creates the new UI for advanced sync flow to be shown under the
MobileIdentityConsistency feature flag

Screenshot: https://crbug.com/1061047#c4

Bug: 1061047
Change-Id: Ia36aefe8b1672d91d87efc0795357374d242a0b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2111153
Commit-Queue: Tanmoy Mollik <triploblastic@chromium.org>
Reviewed-by: Boris Sazonov <bsazonov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755329}