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This CL introduces two kill-switches that guards showing user email on
startup and on sign-in in the avatar button. This way, we simplify the
launch by decoupling the visual changes in the button (the master
feature) from the individual trigger points.

This CL also tweaks the startup trigger by only showing the pill for
multi-profile or multi-account users.

Bug: 1009441
Change-Id: I4f097b385a8469fc59d94494f5528fbefeda8b38
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1831771
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Auto-Submit: Jan Krcal <jkrcal@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703634}