Support allowpaymentrequest with out-of-process iframes

chrome/browser/payments/payment_request_impl.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_PAYMENTS_PAYMENT_REQUEST_IMPL_H_
 #define CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_IMPL_H_
 
 #include "components/payments/payment_request.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
 
 namespace content {
 class WebContents;
 }
 
 namespace payments {
 
 class PaymentRequestImpl : payments::mojom::PaymentRequest,
                            public base::RefCounted<PaymentRequestImpl> {
  public:
   PaymentRequestImpl(
       content::WebContents* web_contents,
       mojo::InterfaceRequest<payments::mojom::PaymentRequest> request);
 
   // payments::mojom::PaymentRequest "stub"
   void Init(payments::mojom::PaymentRequestClientPtr client,
             std::vector<payments::mojom::PaymentMethodDataPtr> methodData,
             payments::mojom::PaymentDetailsPtr details,
             payments::mojom::PaymentOptionsPtr options) override;
-  void Show() override {}
+  void Show() override;
   void UpdateWith(payments::mojom::PaymentDetailsPtr details) override {}
   void Abort() override {}
   void Complete(payments::mojom::PaymentComplete result) override {}
   void CanMakePayment() override {}
 
   void Cancel();
   void OnError();
 
   content::WebContents* web_contents() { return web_contents_; }
 
  private:
   friend class base::RefCounted<PaymentRequestImpl>;
   ~PaymentRequestImpl() override;
 
   content::WebContents* web_contents_;
   mojo::Binding<payments::mojom::PaymentRequest> binding_;
   payments::mojom::PaymentRequestClientPtr client_;
 
   DISALLOW_COPY_AND_ASSIGN(PaymentRequestImpl);
 };
 
 }  // namespace payments
 
 void CreatePaymentRequestHandler(
     content::WebContents* web_contents,
     mojo::InterfaceRequest<payments::mojom::PaymentRequest> request);
 
 #endif  // CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_IMPL_H_