[Web Payments] Add PopMany and Size functions to ViewStack

chrome/browser/ui/views/payments/payment_request_browsertest_base.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/payment_request_browsertest_base.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 118 matching lines @@
 void PaymentRequestBrowserTestBase::OnShippingAddressEditorOpened() {
   if (event_observer_)
     event_observer_->Observe(DialogEvent::SHIPPING_ADDRESS_EDITOR_OPENED);
 }
 
 void PaymentRequestBrowserTestBase::OnBackNavigation() {
   if (event_observer_)
     event_observer_->Observe(DialogEvent::BACK_NAVIGATION);
 }
 
+void PaymentRequestBrowserTestBase::OnBackToPaymentSheetNavigation() {
+  if (event_observer_)
+    event_observer_->Observe(DialogEvent::BACK_TO_PAYMENT_SHEET_NAVIGATION);
+}
+
 void PaymentRequestBrowserTestBase::OnContactInfoOpened() {
   if (event_observer_)
     event_observer_->Observe(DialogEvent::CONTACT_INFO_OPENED);
 }
 
 void PaymentRequestBrowserTestBase::OnEditorViewUpdated() {
   if (event_observer_)
     event_observer_->Observe(DialogEvent::EDITOR_VIEW_UPDATED);
 }
 
@@ skipping 392 matching lines @@
     std::list<DialogEvent> event_sequence) {
   event_observer_ =
       base::MakeUnique<DialogEventObserver>(std::move(event_sequence));
 }
 
 void PaymentRequestBrowserTestBase::WaitForObservedEvent() {
   event_observer_->Wait();
 }
 
 }  // namespace payments