The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f0633f24712d345074d76d653a777f26f687486f

commit f0633f24712d345074d76d653a777f26f687486f
Author: gogerald <gogerald@google.com>
Date: Mon Dec 11 18:10:36 2017

[Payments] Fix the bug that can not pre-select the service worker payment app

This bug is introduced when adding 'user-hint'.
Add more tests to cover it.

Bug:  793476 
Change-Id: I16f4c965a0982ec0015a0a6ecd0aab9fda2b6282
Reviewed-on: https://chromium-review.googlesource.com/818120
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523136}
[modify] https://crrev.com/f0633f24712d345074d76d653a777f26f687486f/chrome/android/java/src/org/chromium/chrome/browser/payments/ServiceWorkerPaymentApp.java
[modify] https://crrev.com/f0633f24712d345074d76d653a777f26f687486f/chrome/android/java/src/org/chromium/chrome/browser/payments/ServiceWorkerPaymentAppBridge.java
[modify] https://crrev.com/f0633f24712d345074d76d653a777f26f687486f/chrome/android/javatests/src/org/chromium/chrome/browser/payments/PaymentRequestServiceWorkerPaymentAppTest.java
[modify] https://crrev.com/f0633f24712d345074d76d653a777f26f687486f/chrome/browser/android/payments/service_worker_payment_app_bridge.cc
[modify] https://crrev.com/f0633f24712d345074d76d653a777f26f687486f/content/browser/payments/payment_app_database.cc