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This CL adds logic for SAML sign-in flows. Whenever the gaia domain is
left in the sign-in flow, it is treated as a SAML sign-in flow, the
profile creation is finalized and the SAML signin continues in a new
browser window.

Bug: 1126913
Change-Id: I48cac367d45567ba7186eb7d4cfa05dc90a0f97f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627426
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843483}