Prevent existing card number to be used for new credit cards in the Payment Request

chrome/browser/ui/views/payments/credit_card_editor_view_controller_browsertest.cc

Index: chrome/browser/ui/views/payments/credit_card_editor_view_controller_browsertest.cc
diff --git a/chrome/browser/ui/views/payments/credit_card_editor_view_controller_browsertest.cc b/chrome/browser/ui/views/payments/credit_card_editor_view_controller_browsertest.cc
index 2e081e933b7ea42a1c4b9b3f6e597e6dc44ac4d8..bf4bc79e85c452b6358443427a251c10ba13f331 100644
--- a/chrome/browser/ui/views/payments/credit_card_editor_view_controller_browsertest.cc
+++ b/chrome/browser/ui/views/payments/credit_card_editor_view_controller_browsertest.cc
@@ -593,6 +593,32 @@ IN_PROC_BROWSER_TEST_F(PaymentRequestCreditCardEditorTest,
             request->state()->selected_instrument());
 }
 
+IN_PROC_BROWSER_TEST_F(PaymentRequestCreditCardEditorTest,
+                       RefuseExistingCardNumber) {
+  autofill::CreditCard card = autofill::test::GetCreditCard();
+  AddCreditCard(card);
+
+  InvokePaymentRequestUI();
+  OpenPaymentMethodScreen();
+  OpenCreditCardEditorScreen();
+
+  SetEditorTextfieldValue(card.number(), autofill::CREDIT_CARD_NUMBER);
+  ValidatingTextfield* textfield = static_cast<ValidatingTextfield*>(
+      dialog_view()->GetViewByID(EditorViewController::GetInputFieldViewId(
+          autofill::CREDIT_CARD_NUMBER)));
+  ASSERT_TRUE(textfield);
+  EXPECT_TRUE(textfield->invalid());
+  EXPECT_EQ(l10n_util::GetStringUTF16(
+                IDS_PAYMENTS_VALIDATION_ALREADY_USED_CREDIT_CARD_NUMBER),
+            GetErrorLabelForType(autofill::CREDIT_CARD_NUMBER));
+
+  // Now fix it.
+  ASSERT_NE(base::ASCIIToUTF16("4111111111111129"), card.number());
+  SetEditorTextfieldValue(base::ASCIIToUTF16("4111111111111129"),
+                          autofill::CREDIT_CARD_NUMBER);
+  EXPECT_FALSE(textfield->invalid());
+}
+
 IN_PROC_BROWSER_TEST_F(PaymentRequestCreditCardEditorTest, EnteringEmptyData) {
   InvokePaymentRequestUI();