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chrome://signin-reauth needs to display different strings depending
on ReauthAccessPoint parameter. Callers pass this parameter to
SigninReauthUI as a URL query parameter.

chrome/browser/signin/reauth_util takes care of generating a
corresponding URL and reading an encoded parameter from in.

Bug: 1045515
Change-Id: Ib83ca63cf179fe04a58ba889d8ad0629d54df688
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2254144
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780728}