[Payments] Add support for required fields in editor validation

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

Index: chrome/browser/ui/views/payments/payment_request_credit_card_editor_interactive_uitest.cc
diff --git a/chrome/browser/ui/views/payments/payment_request_credit_card_editor_interactive_uitest.cc b/chrome/browser/ui/views/payments/payment_request_credit_card_editor_interactive_uitest.cc
index 2dfcc616ea0a0b2f90a365f81bec896fc5860e0b..2f75250e9d3bd83bb307992d5387e9817bf5b704 100644
--- a/chrome/browser/ui/views/payments/payment_request_credit_card_editor_interactive_uitest.cc
+++ b/chrome/browser/ui/views/payments/payment_request_credit_card_editor_interactive_uitest.cc
@@ -6,6 +6,7 @@
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/views/payments/payment_request_dialog_view_ids.h"
 #include "chrome/browser/ui/views/payments/payment_request_interactive_uitest_base.h"
+#include "chrome/browser/ui/views/payments/validating_textfield.h"
 #include "components/autofill/core/browser/field_types.h"
 #include "components/autofill/core/browser/personal_data_manager.h"
 #include "components/payments/payment_request.h"
@@ -81,4 +82,23 @@ IN_PROC_BROWSER_TEST_F(PaymentRequestCreditCardEditorTest,
   EXPECT_EQ(0u, personal_data_manager->GetCreditCards().size());
 }
 
+IN_PROC_BROWSER_TEST_F(PaymentRequestCreditCardEditorTest, EnteringEmptyData) {
+  InvokePaymentRequestUI();
+
+  OpenPaymentMethodScreen();
+
+  OpenCreditCardEditorScreen();
+
+  // Setting empty data and unfocusing a required textfield will make it
+  // invalid.
+  SetEditorTextfieldValue(base::ASCIIToUTF16(""),
+                          autofill::CREDIT_CARD_NAME_FULL);
+
+  ValidatingTextfield* textfield =
+      static_cast<ValidatingTextfield*>(dialog_view()->GetViewByID(
+          static_cast<int>(autofill::CREDIT_CARD_NAME_FULL)));
+  EXPECT_TRUE(textfield);
+  EXPECT_TRUE(textfield->invalid());
+}
+
 }  // namespace payments