PaymentApp: Implement invokePaymentApp for Android
This change implements the
ServiceWorkerPaymentAppBridge.invokePaymentApp() function along with the
corresponding native InvokePaymentApp() function.
The signature of PaymentInstrument.invokePaymentApp() has also been
changed to add the payment details modifiers field, and to align the
ordering and naming of the arguments with the definition of the
PaymentAppRequest dictionary in the specification:
https://w3c.github.io/webpayments-payment-apps-api/#sec-app-request
BUG=669876
Review-Url: https://codereview.chromium.org/2640743005
Cr-Commit-Position: refs/heads/master@{#445301}
8 files changed
