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This patch enables the just-in-time installation of a payment handler
when merchant website calls PaymentRequest.show() with a user gesture.

Bug: 866996
Change-Id: I38b1ae7f672201f19ebe4011e22323ec5a572f36
Reviewed-on: https://chromium-review.googlesource.com/1190406Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587353}