Enable "interledger" non-URI payment method.

After this patch, Android payment applications can support "interledger"
payment method by adding the following section to their
AndroidManifest.xml file:

<activity android:name=".PaymentActivity" android:exported="true">
  <intent-filter>
    <action android:name="org.chromium.intent.action.PAY" />
  </intent-filter>
  <meta-data android:name="org.chromium.default_payment_method_name"
             android:value="interledger" />
</activity>

Flag:
chrome://flags/#android-payment-apps

Design:
https://docs.google.com/document/d/1izV4uC-tiRJG3JLooqY3YRLU22tYOsLTNq0P_InPJeE

BUG=715577

Review-Url: https://codereview.chromium.org/2850503002
Cr-Commit-Position: refs/heads/master@{#467689}

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

@@ -48,12 +48,6 @@ public class AndroidPaymentAppFinder implements ManifestVerifyCallback {
     /* package */ static final String ACTION_IS_READY_TO_PAY =
                           "org.chromium.intent.action.IS_READY_TO_PAY";
 
-    /**
-     * The basic-card payment method name used by merchant and defined by W3C:
-     * https://w3c.github.io/webpayments-methods-card/#method-id
-     */
-    /* package */ static final String BASIC_CARD_PAYMENT_METHOD = "basic-card";
-
     /**
      * Meta data name of an app's supported payment method names.
      */
@@ -124,7 +118,10 @@ public class AndroidPaymentAppFinder implements ManifestVerifyCallback {
 
         // For non-URI payment method names, only names published by W3C should be supported.
         Set<String> supportedNonUriPaymentMethods = new HashSet<>();
-        supportedNonUriPaymentMethods.add(BASIC_CARD_PAYMENT_METHOD);
+        // https://w3c.github.io/webpayments-methods-card/
+        supportedNonUriPaymentMethods.add("basic-card");
+        // https://w3c.github.io/webpayments/proposals/interledger-payment-method.html
+        supportedNonUriPaymentMethods.add("interledger");
 
         mNonUriPaymentMethods = new HashSet<>();
         mUriPaymentMethods = new HashSet<>();

chrome/android/junit/src/org/chromium/chrome/browser/payments/AndroidPaymentAppFinderTest.java

@@ -91,7 +91,7 @@ public class AndroidPaymentAppFinderTest {
                              ArgumentMatchers.argThat(sPayIntentArgumentMatcher)))
                 .thenReturn(new ArrayList<ResolveInfo>());
         Set<String> methodNames = new HashSet<>();
-        methodNames.add(AndroidPaymentAppFinder.BASIC_CARD_PAYMENT_METHOD);
+        methodNames.add("basic-card");
         PaymentAppCreatedCallback callback = Mockito.mock(PaymentAppCreatedCallback.class);
 
         AndroidPaymentAppFinder.find(Mockito.mock(WebContents.class), methodNames,
@@ -121,7 +121,7 @@ public class AndroidPaymentAppFinderTest {
                 .thenReturn(activities);
 
         Set<String> methodNames = new HashSet<>();
-        methodNames.add(AndroidPaymentAppFinder.BASIC_CARD_PAYMENT_METHOD);
+        methodNames.add("basic-card");
         PaymentAppCreatedCallback callback = Mockito.mock(PaymentAppCreatedCallback.class);
 
         AndroidPaymentAppFinder.find(Mockito.mock(WebContents.class), methodNames,
@@ -156,7 +156,7 @@ public class AndroidPaymentAppFinderTest {
                 .thenReturn(activities);
 
         Set<String> methodNames = new HashSet<>();
-        methodNames.add(AndroidPaymentAppFinder.BASIC_CARD_PAYMENT_METHOD);
+        methodNames.add("basic-card");
         PaymentAppCreatedCallback callback = Mockito.mock(PaymentAppCreatedCallback.class);
 
         AndroidPaymentAppFinder.find(Mockito.mock(WebContents.class), methodNames,
@@ -213,11 +213,9 @@ public class AndroidPaymentAppFinderTest {
 
         Resources resouces = Mockito.mock(Resources.class);
         Mockito.when(resouces.getStringArray(ArgumentMatchers.eq(1)))
-                .thenReturn(new String[] {
-                        "https://alicepay.com", AndroidPaymentAppFinder.BASIC_CARD_PAYMENT_METHOD});
+                .thenReturn(new String[] {"https://alicepay.com", "basic-card"});
         Mockito.when(resouces.getStringArray(ArgumentMatchers.eq(2)))
-                .thenReturn(new String[] {
-                        "https://bobpay.com", AndroidPaymentAppFinder.BASIC_CARD_PAYMENT_METHOD});
+                .thenReturn(new String[] {"https://bobpay.com", "basic-card"});
 
         Mockito.when(packageManagerDelegate.getResourcesForApplication(
                              ArgumentMatchers.eq(alicePay.activityInfo.applicationInfo)))
@@ -227,7 +225,7 @@ public class AndroidPaymentAppFinderTest {
                 .thenReturn(resouces);
 
         Set<String> methodNames = new HashSet<>();
-        methodNames.add(AndroidPaymentAppFinder.BASIC_CARD_PAYMENT_METHOD);
+        methodNames.add("basic-card");
         PaymentAppCreatedCallback callback = Mockito.mock(PaymentAppCreatedCallback.class);
 
         AndroidPaymentAppFinder.find(Mockito.mock(WebContents.class), methodNames,
@@ -267,8 +265,7 @@ public class AndroidPaymentAppFinderTest {
 
         Resources resouces = Mockito.mock(Resources.class);
         Mockito.when(resouces.getStringArray(ArgumentMatchers.eq(1)))
-                .thenReturn(new String[] {
-                        "https://bobpay.com", AndroidPaymentAppFinder.BASIC_CARD_PAYMENT_METHOD});
+                .thenReturn(new String[] {"https://bobpay.com", "basic-card"});
 
         Mockito.when(packageManagerDelegate.getResourcesForApplication(
                              ArgumentMatchers.eq(bobPay.activityInfo.applicationInfo)))