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This CL adds a "supervised" argument to the X-Chrome-Connected header
when the account that is signed in to Chrome is a child account.

Design document (Google internal):
https://docs.google.com/document/d/1u5PUBIeTxXiKSpqJHDiSuc9hJ2Y9_Te4ja5eJdLfZk4/edit?usp=sharing

Bug: 1103228

Change-Id: Ic90021207213d926ed2dbb54b78eb4d9559a0da3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2431524
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813007}