[Web Payments] Add Cancel button to all sheets

chrome/browser/ui/views/payments/payment_request_sheet_controller.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_SHEET_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_SHEET_CONTROLLER_H_
 
 #include <memory>
 
 #include "base/logging.h"

[please use gerrit instead, 2017/02/01 14:33:35]

No longer used.

[anthonyvd, 2017/02/01 15:35:23]

Done.

 #include "base/macros.h"
+#include "ui/views/controls/button/vector_icon_button_delegate.h"
 
 namespace views {
 class View;
 }
 
 namespace payments {
 
 class PaymentRequestDialogView;
 class PaymentRequest;
 
 // The base class for objects responsible for the creation and event handling in
 // views shown in the PaymentRequestDialog.
-class PaymentRequestSheetController {
+class PaymentRequestSheetController : public views::VectorIconButtonDelegate {
  public:
   // Objects of this class are owned by |dialog|, so it's a non-owned pointer
   // that should be valid throughout this object's lifetime.
   // |request| is also not owned by this and is guaranteed to outlive dialog.
   // Neither |request| or |dialog| should be null.
   PaymentRequestSheetController(PaymentRequest* request,
-                                PaymentRequestDialogView* dialog)
-      : request_(request), dialog_(dialog) {
-    DCHECK(request_);
-    DCHECK(dialog_);
-  }
-  virtual ~PaymentRequestSheetController() {}
+                                PaymentRequestDialogView* dialog);
+  ~PaymentRequestSheetController() override {}
 
   virtual std::unique_ptr<views::View> CreateView() = 0;
 
   // The PaymentRequest object associated with this instance of the dialog.
   // Caller should not take ownership of the result.
   PaymentRequest* request() { return request_; }
 
   // The dialog that contains and owns this object.
   // Caller should not take ownership of the result.
   PaymentRequestDialogView* dialog() { return dialog_; }
 
+ protected:
+  // views::VectorIconButtonDelegate:
+  void ButtonPressed(views::Button* sender, const ui::Event& event) override;
+
  private:
   // Not owned. Will outlive this.
   PaymentRequest* request_;
   // Not owned. Will outlive this.
   PaymentRequestDialogView* dialog_;
 
   DISALLOW_COPY_AND_ASSIGN(PaymentRequestSheetController);
 };
 
 }  // namespace payments
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_SHEET_CONTROLLER_H_