My understanding: AccountReconcilor is the place that uses the "ubercookie" which gives us the system login basically, to merge system accounts into the chrome account list.

To make this work, something like..
- Add "whitelisted accounts" to account reconciler
 - It should be appended on-the-fly to the system accounts when checking whether
   the cookie contains the correct data.
 - See components/signin/core/browser/account_reconcilor.h
accounts.
- Add support for showing a web login
 - maybe see if something in components/signin/core/browser/signin_header_helper.h
   can help.
 - Somehow scrape the e-mail address and ensure that the web login calls
   /MergeSession. The Web login probably does this automatically.
- In the clank settings UI, add support for also showing the "whitelisted accounts".
 - The logout button will log out ALL accounts.
 - The call to logout should clear the whitelisted accounts from the account
   reconciler.
 - When logging in again, only the system accounts should be automatically logged
   in again by the account reconciler.

Thre reconciler has the system-accounts list and the "in-the-cookie" accounts, and tries to keep them in sync. Maybe add a third list "whitelisted" that is appended to the system-list before the reconciling. Except that you wouldn't be able to automatically reconcile later, so they would have to be "one-offs". Because to "reconcile" it'd need that uber token, which it gets from the android system.

Maybe we could land this behind a flag? Then again, I guess flags aren't really meant as the way we want to maintain features... Maybe it in the end could evolve from behind-a-flag to behind-an-advanced-setting.

Well I found the place where the redirect happens, it's calls to signin::AppendMirrorRequestHeaderHelper, of which there are two in chrome_resource_dispatcher_host_delegate.cc: https://cs.chromium.org/search/?q=signin::AppendMirrorRequestHeaderHelper&sq=package:chromium&type=cs

If I don't do that, then I can log in normally.

Need to understand why im getting userdebug red borders when i use a clankium build tho.

I built and installed with the change described at 3 and was able to log into gaia sites without using mirror at all. But I was getting crashes which may or may not be related to the change, since I was building TOT and not using chrome-branding and stuff, I didn't try investigate more since then yet.

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

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Downgrading P2s that haven't been modified in more than 6 months, which have no component or owner.

Available, but no owner or component? Please find a component, as no one will ever find this without one.