[Web Payments] Add PopMany and Size functions to ViewStack

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

 // Copyright 2016 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_DIALOG_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_DIALOG_VIEW_H_
 
 #include <map>
 #include <memory>
 
@@ skipping 41 matching lines @@
     virtual void OnShippingAddressSectionOpened() = 0;
 
     virtual void OnShippingOptionSectionOpened() = 0;
 
     virtual void OnCreditCardEditorOpened() = 0;
 
     virtual void OnShippingAddressEditorOpened() = 0;
 
     virtual void OnBackNavigation() = 0;
 
+    virtual void OnBackToPaymentSheetNavigation() = 0;
+
     virtual void OnEditorViewUpdated() = 0;
 
     virtual void OnErrorMessageShown() = 0;
 
     virtual void OnSpecDoneUpdating() = 0;
 
     virtual void OnCvcPromptShown() = 0;
   };
 
   // Build a Dialog around the PaymentRequest object. |observer| is used to
@@ skipping 15 matching lines @@
   void ShowDialog() override;
   void CloseDialog() override;
   void ShowErrorMessage() override;
 
   // PaymentRequestSpec::Observer:
   void OnInvalidSpecProvided() override {}
   void OnSpecUpdated() override;
 
   void Pay();
   void GoBack();
+  void GoBackToPaymentSheet();
   void ShowContactProfileSheet();
   void ShowOrderSummary();
   void ShowShippingProfileSheet();
   void ShowPaymentMethodSheet();
   void ShowShippingOptionSheet();
   // |credit_card| is the card to be edited, or nullptr for adding a card.
   // |on_edited| is called when |credit_card| was successfully edited, and
   // |on_added| is called when a new credit card was added (the reference is
   // short-lived; callee should make a copy of the CreditCard object).
   void ShowCreditCardEditor(
@@ skipping 44 matching lines @@
   // Used when the dialog is being closed to avoid re-entrancy into the
   // controller_map_.
   bool being_closed_;
 
   DISALLOW_COPY_AND_ASSIGN(PaymentRequestDialogView);
 };
 
 }  // namespace payments
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_DIALOG_VIEW_H_