[Web Payments] Add data attribution string to dialog

components/payments/core/payment_request_delegate.h

 // 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.
 
 #ifndef COMPONENTS_PAYMENTS_CORE_PAYMENT_REQUEST_DELEGATE_H_
 #define COMPONENTS_PAYMENTS_CORE_PAYMENT_REQUEST_DELEGATE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 56 matching lines @@
 
   // Returns a pointer to the address normalizer to use for the duration of this
   // Payment Request.
   virtual AddressNormalizer* GetAddressNormalizer() = 0;
 
   // Creates a new region data loader that will self delete, or a test mock.
   virtual autofill::RegionDataLoader* GetRegionDataLoader() = 0;
 
   // Returns a pointer to the UKM service.
   virtual ukm::UkmService* GetUkmService() = 0;
+
+  // Returns the user's signed-in email address, or empty string if not signed
+  // in.
+  virtual std::string GetAuthenticatedEmail() const = 0;
+
+  // Gets the pref service for the browser context associated with this
+  // PaymentRequest.
+  virtual PrefService* GetPrefService() = 0;
 };
 
 }  // namespace payments
 
 #endif  // COMPONENTS_PAYMENTS_CORE_PAYMENT_REQUEST_DELEGATE_H_