[Web Payments] Handle "Enter" accelerator when there's a primary action

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/macros.h"
@@ skipping 100 matching lines @@
   // +---------------------------+
   // |        HEADER VIEW        |
   // +---------------------------+
   // |          CONTENT          |
   // |           VIEW            |
   // +---------------------------+
   // | EXTRA VIEW | PAY | CANCEL | <-- footer
   // +---------------------------+
   std::unique_ptr<views::View> CreatePaymentView();
 
+  // Called when the Enter accelerator is pressed. Perform the action associated
+  // with the primary button and returns true if it's enabled, returns false
+  // otherwise.
+  bool PerformPrimaryButtonAction();
+
   // All these are not owned. Will outlive this.
   PaymentRequestSpec* spec_;
   PaymentRequestState* state_;
   PaymentRequestDialogView* dialog_;
 
   // This view is owned by its encompassing ScrollView.
   views::View* pane_;
   views::View* content_view_;
 
   // Hold on to the ScrollView because it must be explicitly laid out in some
   // cases.
   std::unique_ptr<views::ScrollView> scroll_;
 
   // Hold on to the primary and secondary buttons to use them as initial focus
   // targets when subclasses don't want to focus anything else.
   std::unique_ptr<views::Button> primary_button_;
   std::unique_ptr<views::Button> secondary_button_;
 
   DISALLOW_COPY_AND_ASSIGN(PaymentRequestSheetController);
 };
 
 }  // namespace payments
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_SHEET_CONTROLLER_H_