Add "AutofillScanCardholderName" feature.

components/autofill/core/browser/autofill_manager.cc

Index: components/autofill/core/browser/autofill_manager.cc
diff --git a/components/autofill/core/browser/autofill_manager.cc b/components/autofill/core/browser/autofill_manager.cc
index 1eea943cd6bb46745419f9a7c33a188b2fd423c7..4ee1303a6d7f7731016cb93ac3f378f710c59fc0 100644
--- a/components/autofill/core/browser/autofill_manager.cc
+++ b/components/autofill/core/browser/autofill_manager.cc
@@ -16,6 +16,7 @@
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/containers/adapters.h"
+#include "base/feature_list.h"
 #include "base/files/file_util.h"
 #include "base/guid.h"
 #include "base/logging.h"
@@ -270,10 +271,13 @@ bool AutofillManager::ShouldShowScanCreditCard(const FormData& form,
       autofill_field->Type().GetStorableType() == CREDIT_CARD_NUMBER &&
       base::ContainsOnlyChars(CreditCard::StripSeparators(field.value),
                               base::ASCIIToUTF16("0123456789"));
-  if (!is_card_number_field &&
-      autofill_field->Type().GetStorableType() != CREDIT_CARD_NAME_FULL) {
+
+  bool is_scannable_name_on_card_field =
+      autofill_field->Type().GetStorableType() == CREDIT_CARD_NAME_FULL &&
+      base::FeatureList::IsEnabled(kAutofillScanCardholderName);
+
+  if (!is_card_number_field && !is_scannable_name_on_card_field)
     return false;
-  }
 
   static const int kShowScanCreditCardMaxValueLength = 6;
   return field.value.size() <= kShowScanCreditCardMaxValueLength;