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Starting a Chrome OS session (e.g. on Linux build) using "--login-profile=" and then pressing Ctrl+Shift+L triggers some nasty behavior, as the sign-in profile was not loaded yet (which is not the case during normal boot-up, as this profile is usually the first thing that loads). This patch aims to force its loading for such cases.
This affects not only stub login, but also any session that was restored.
Current patch reiterates CL from https://codereview.chromium.org/240333011/

BUG=346763

Review URL: https://codereview.chromium.org/933503004

Cr-Commit-Position: refs/heads/master@{#318220}