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Skip-to-GPay is an experimental flow that skips the payment sheet for
{basic-card, GPay} hybrid requests. Today requests for shipping and
contact information is fulfilled using autofill data, this requires the
payment sheet to be shown to the user to confirm the information. Since
the Payment Handler API does not yet support a general mechanism for
delegating shipping and contact information to payment handlers, this
patch is part of a bridge solution customized for GPay.

With this patch, the renderer process will detect {basic-card, GPay}
hybrid requests that are eligible for the skip-to-GPay flow. Then it
creates a copy of the merchant-provided GPay-specific-data, and sets
additional parameters to request shipping and contact information from
GPay based on the merchant-provided PaymentOptions. The copy is passed
to the browser process to make a final decision (based on a Feature flag)
whether to invoke the skip-to-GPay flow.

The browser process changes will be landed in a separate patch.

Design Doc: https://docs.google.com/document/d/1rCA4tk1xS3nwiRqmAk1eCAh64K55wHOE1JWYNTqm9LQ/edit#

Bug: 877284
Change-Id: I7822fe0157fa6ee77e48035a2c1c0fae41168c8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769853
Commit-Queue: Danyao Wang <danyao@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692072}