[Payments] Field trial and flag to abort payment request if no card.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index bfa6859e3b281212f3082582aa6129e56a255e71..f01340fee67f91810a7ef8c49c6f18cfa72c2b2b 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -2072,6 +2072,11 @@ const FeatureEntry kFeatureEntries[] = {
      IDS_FLAGS_ENABLE_DEFAULT_MEDIA_SESSION_DESCRIPTION, kOsDesktop,
      MULTI_VALUE_TYPE(kEnableDefaultMediaSessionChoices)},
 #endif  // !defined(OS_ANDROID)
+#if defined(OS_ANDROID)
+    {"no-card-abort", IDS_FLAGS_NO_CARD_ABORT,
+    IDS_FLAGS_NO_CARD_ABORT_DESCRIPTION, kOsAndroid,
+    FEATURE_VALUE_TYPE(chrome::android::kNoCreditCardAbort)},
+#endif  // OS_ANDROID
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.