[Web Payments] Add PopMany and Size functions to ViewStack

chrome/browser/ui/views/payments/editor_view_controller.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 "chrome/browser/ui/views/payments/editor_view_controller.h"
 
 #include <map>
 #include <memory>
 #include <utility>
 
@@ skipping 106 matching lines @@
   // TODO(crbug.com/704254): Find how to update the parent view bounds so that
   // the vertical scrollbar size gets updated.
   dialog()->EditorViewUpdated();
 }
 
 void EditorViewController::ButtonPressed(views::Button* sender,
                                          const ui::Event& event) {
   switch (sender->tag()) {
     case static_cast<int>(EditorViewControllerTags::SAVE_BUTTON):
       if (ValidateModelAndSave())
-        dialog()->GoBack();
+        dialog()->GoBackToPaymentSheet();
       break;
     default:
       PaymentRequestSheetController::ButtonPressed(sender, event);
       break;
   }
 }
 
 void EditorViewController::ContentsChanged(views::Textfield* sender,
                                            const base::string16& new_contents) {
   static_cast<ValidatingTextfield*>(sender)->OnContentsChanged();
@@ skipping 104 matching lines @@
   error_label->SetFontList(
       error_label->GetDefaultFontList().DeriveWithSizeDelta(-1));
   error_label->SetEnabledColor(error_label->GetNativeTheme()->GetSystemColor(
       ui::NativeTheme::kColorId_AlertSeverityHigh));
   error_labels_[field] = error_label.get();
 
   layout->AddView(error_label.release());
 }
 
 }  // namespace payments