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Before this patch, C++ payment app implementations used an enum to
denote their type to be used for app-specific logic, while Java used
"instanceof". This prevented encapsulating multiple types of payment
apps in a single wrapper, e.g., service_worker_payment_app.cc and
android_payment_app.cc in a single JniPaymentApp.java wrapper.

This patch expands the number of payment apps, exposes the payment app
enum to Java, adds the type enum to PaymentApp.java class, and replaces
"instanceof" with enum comparison in PaymentRequestImpl.java, where it
makes sense.

After this patch, both C++ and Java payment app types are defined in an
enum, so JniPaymentApp.java can wrap multiple types of C++ payment apps
internally.

Design: https://bit.ly/cross-platform-pay-app-factory

Bug: 1022512
Change-Id: I3636f83cda85c29113ad6bd0671b430c70c67a1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2213405
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Danyao Wang <danyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772173}