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Before this patch, the secure payment confirmation parameters to
PaymentRequest API from Blink would not be passed to the browser
process.

This patch adds Mojo IPC for secure payment confirmation parameters and
new type of payment app for the Web Payment that is based on these
parameters.

After this patch, Blink passes the secure payment confirmation
parameters to the browser over mojo IPC and the browser uses these
parameters to construct a payment app (when "SecurePaymentConfirmation"
Blink runtime flag is enabled).

Design: https://bit.ly/secure-payment-confirmation
Explainer: https://github.com/rsolomakhin/secure-payment-confirmation

Bug: 1110320
Change-Id: I7b9329d8d6c9724dd05b8d30492677baf2677186
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359733
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Nick Burris <nburris@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800400}