[Payments] Add a Pay button in the Order summary screen

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 71 matching lines @@
   // the PaymentRequest object always outlives this one, the pointer should
   // always be valid even though there is no direct ownership relationship
   // between the two.
   PaymentRequest* request_;
   ControllerMap controller_map_;
   ViewStack view_stack_;
 
   // May be null.
   ObserverForTest* observer_for_testing_;
 
+  // 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_