[Payments] Implements the credit card editor for Desktop UI

chrome/browser/ui/views/payments/payment_request_dialog_view.h

Index: chrome/browser/ui/views/payments/payment_request_dialog_view.h
diff --git a/chrome/browser/ui/views/payments/payment_request_dialog_view.h b/chrome/browser/ui/views/payments/payment_request_dialog_view.h
index f6751de848cdde7dcf94324237e2ac00fefcb550..9d70cef9e4b4e3d27c0805538bb7b85a1b8584c3 100644
--- a/chrome/browser/ui/views/payments/payment_request_dialog_view.h
+++ b/chrome/browser/ui/views/payments/payment_request_dialog_view.h
@@ -35,6 +35,12 @@ class PaymentRequestDialogView : public views::DialogDelegateView,
     virtual void OnDialogOpened() = 0;
 
     virtual void OnOrderSummaryOpened() = 0;
+
+    virtual void OnPaymentMethodOpened() = 0;
+
+    virtual void OnCreditCardEditorOpened() = 0;
+
+    virtual void OnBackNavigation() = 0;
   };
 
   // Build a Dialog around the PaymentRequest object. |observer| is used to
@@ -60,6 +66,9 @@ class PaymentRequestDialogView : public views::DialogDelegateView,
   void ShowOrderSummary();
   void ShowShippingListSheet();
   void ShowPaymentMethodSheet();
+  void ShowCreditCardEditor();
+
+  ViewStack* view_stack_for_testing() { return &view_stack_; }
 
  private:
   void ShowInitialPaymentSheet();