[Payments] Upload card UI now has a CVC prompt

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 7b6ea0f4ebe9259d92943574a4b6f413799abb27..af908982a2895972c5b45de5c1211b7456a7a06c 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -2339,6 +2339,17 @@ const FeatureEntry kFeatureEntries[] = {
          autofill::kAutofillCreditCardLastUsedDateDisplay,
          kAutofillCreditCardLastUsedDateFeatureVariations,
          "AutofillCreditCardLastUsedDate")},
+
+#if defined(OS_CHROMEOS) || defined(OS_LINUX) || defined(OS_MACOSX) || \
+    defined(OS_WIN)
+    {"enable-autofill-credit-card-upload-request-cvc-if-missing",
+     flag_descriptions::kAutofillUpstreamRequestCvcIfMissing,
+     flag_descriptions::kAutofillUpstreamRequestCvcIfMissingDescription,
+     kOsDesktop,
+     FEATURE_VALUE_TYPE(autofill::kAutofillUpstreamRequestCvcIfMissing)},
+#endif  // defined(OS_CHROMEOS) || defined(OS_LINUX) || defined(OS_MACOSX) ||
+        // defined(OS_WIN)
+
 #if defined(OS_WIN)
     {"windows10-custom-titlebar",
      flag_descriptions::kWindows10CustomTitlebarName,