[Payments] Create and add AutofillPaymentApp before show is called.

chrome/android/java/src/org/chromium/chrome/browser/payments/AutofillPaymentApp.java

Index: chrome/android/java/src/org/chromium/chrome/browser/payments/AutofillPaymentApp.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/payments/AutofillPaymentApp.java b/chrome/android/java/src/org/chromium/chrome/browser/payments/AutofillPaymentApp.java
index ad5ba25010fccae32b78106962a2b7238cf28235..6b769b434e8d6971d65316bca6e72e58a86eddbe 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/payments/AutofillPaymentApp.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/payments/AutofillPaymentApp.java
@@ -129,8 +129,13 @@ public class AutofillPaymentApp implements PaymentApp {
 
     @Override
     public boolean supportsMethodsAndData(Map<String, PaymentMethodData> methodDataMap) {
-        assert methodDataMap != null;
+        return merchantSupportsAutofillPaymentInstruments(methodDataMap);
+    }
 
+    /** @return True if the merchant methodDataMap supports autofill payment instruments. */
+    public static boolean merchantSupportsAutofillPaymentInstruments(
+            Map<String, PaymentMethodData> methodDataMap) {
+        assert methodDataMap != null;
         PaymentMethodData basicCardData = methodDataMap.get(BASIC_CARD_METHOD_NAME);
         if (basicCardData != null) {
             Set<String> basicCardNetworks = convertBasicCardToNetworks(basicCardData);