[Web Payments] Add "pencil" edit button to lists.

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

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/views/payments/payment_request_browsertest_base.h"
 #include "chrome/browser/ui/views/payments/payment_request_dialog_view_ids.h"
 #include "components/autofill/core/browser/autofill_test_utils.h"
 #include "components/autofill/core/browser/personal_data_manager.h"
 #include "components/payments/content/payment_request.h"
@@ skipping 96 matching lines @@
       static_cast<int>(DialogViewID::CHECKMARK_VIEW));
   checkmark_view2 = list_view->child_at(1)->GetViewByID(
       static_cast<int>(DialogViewID::CHECKMARK_VIEW));
   EXPECT_FALSE(checkmark_view->visible());
   EXPECT_TRUE(checkmark_view2->visible());
 
   EXPECT_EQ(request->state()->available_instruments().back().get(),
             request->state()->selected_instrument());
 }
 
+IN_PROC_BROWSER_TEST_F(PaymentMethodViewControllerTest, EditButtonOpensEditor) {
+  AddCreditCard(autofill::test::GetCreditCard());
+
+  InvokePaymentRequestUI();
+  OpenPaymentMethodScreen();
+
+  views::View* list_view = dialog_view()->GetViewByID(
+      static_cast<int>(DialogViewID::PAYMENT_METHOD_SHEET_LIST_VIEW));
+  EXPECT_TRUE(list_view);
+  EXPECT_EQ(1, list_view->child_count());
+
+  views::View* edit_button = list_view->child_at(0)->GetViewByID(
+      static_cast<int>(DialogViewID::EDIT_ITEM_BUTTON));
+
+  ResetEventObserver(DialogEvent::CREDIT_CARD_EDITOR_OPENED);
+  ClickOnDialogViewAndWait(edit_button);
+}
+
 }  // namespace payments