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We add FIDO auth toggle on Clank Autofill Payment settings page. The
toggle is shown only when 1) autofill is enabled 2) sync is enabled 3)
feature flag is enabled. The requirement check is accomplished by
adding one more PersonalDataManager bridge function.

We reuse FIDOAuthEnabled preference to show current user's status and
record user's intention (intent to opt in/out). The preference is exposed
to Java side in order to get/set the preference via PrefServiceBridge.

Local tested video (Googlers only): https://drive.google.com/a/google.com/file/d/1nJ1pSJZu1e5oV6qle_Piog6-a-v7kmZs/view?usp=sharing
For more detailed background (Googlers only): go/autofill-auth-clank-settings

Bug: 949269
Change-Id: Iefad4c953eee4dc00ec54627810b135c1eec6206
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2029255
Commit-Queue: Sujie Zhu <sujiezhu@google.com>
Reviewed-by: sebsg <sebsg@chromium.org>
Reviewed-by: Manas Verma <manasverma@google.com>
Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Jared Saul <jsaul@google.com>
Cr-Commit-Position: refs/heads/master@{#738766}