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Before this patch, if the only method of payment available was a payment
handler that is not yet installed, but is available or installation
Just-In-Time (JIT), then PaymentRequest.canMakePayment() would return
"false". This prevented JIT installable payment handler usage by
merchants that don't call PaymentRequest.show() unless
PaymentRequest.canMakePayment() returns true.

This patch makes canMakePayment() return "true" for JIT installable
payment handlers on both desktop and Android. (iOS does not support
payment handlers at this point.)

After this patch, if the only method of payment available is a payment
handler that is not yet installed, but is available for JIT
installation, then PaymentRequest.canMakePayment() would return "true".

Bug: 877644
Change-Id: I614a02789b514d5d0e7738ca827178a844e74199
Reviewed-on: https://chromium-review.googlesource.com/1188900
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586252}