[WebPayments] Start populating the Payment Sheet.

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

Index: chrome/browser/ui/views/payments/payment_request_dialog.cc
diff --git a/chrome/browser/ui/views/payments/payment_request_dialog.cc b/chrome/browser/ui/views/payments/payment_request_dialog.cc
index 3f8daf32b5efc406805363a76e26f49b766fba6e..0856a5a1153f8b3d5716e5a68620e0baf674bb99 100644
--- a/chrome/browser/ui/views/payments/payment_request_dialog.cc
+++ b/chrome/browser/ui/views/payments/payment_request_dialog.cc
@@ -71,6 +71,23 @@ bool PaymentRequestDialog::Cancel() {
   return true;
 }
 
+bool PaymentRequestDialog::ShouldShowCloseButton() const {
+  // Don't show the normal close button on the dialog. This is because the
+  // typical dialog header doesn't allow displaying anything other that the
+  // title and the close button. This is insufficient for the PaymentRequest
+  // dialog, which must sometimes show the back arrow next to the title.
+  // Moreover, the title (and back arrow) should animate with the view they're
+  // attached to.
+  return false;
+}
+
+int PaymentRequestDialog::GetDialogButtons() const {
+  // The buttons should animate along with the different dialog sheets since
+  // each sheet presents a different set of buttons. Because of this, hide the
+  // usual dialog buttons.
+  return ui::DIALOG_BUTTON_NONE;
+}
+
 void PaymentRequestDialog::GoBack() {
   view_stack_.Pop();
 }
@@ -82,6 +99,10 @@ void PaymentRequestDialog::ShowOrderSummary() {
         true);
 }
 
+void PaymentRequestDialog::CloseDialog() {
+  GetWidget()->Close();
+}
+
 void PaymentRequestDialog::ShowInitialPaymentSheet() {
   view_stack_.Push(
       CreateViewAndInstallController<PaymentSheetViewController>(