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This CL passes the information that the default promo account was selected
from the settings WebUI when the user attempts to enable sync. This leads
to the right histograms Signin.SigninStartedAccessPoint.{NewAccount|NotDefault|WithDefault}
when sync is enabled from settings.

This CL is a follow-up to https://chromium-review.googlesource.com/c/chromium/src/+/986141

Bug: 819431
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I55c7390819ace71ae6cb937248d2d425a5a0396f
Reviewed-on: https://chromium-review.googlesource.com/999420
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#549510}