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This patch introduces the basic API for IDP to provide an id_token.
The id_token is passed to the pending id request callback.

The callback is simply held as part of UserData for the provider's
web contents. This works because we create a new web content for each
request.

To enable this without introducing new content/public changes
we moved the creation of the idp web contents to occur inside
FederatedAuthRequestImpl which also adds the callback and then passes it
to the ui dialog controller.

Bug: 1141125

Change-Id: Ic5d48642c952ac510ce8aa8cfaf53962a916f9ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2576432Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Majid Valipour <majidvp@chromium.org>
Auto-Submit: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835781}