[Web Payments] Add data attribution string to dialog

components/payments/core/payment_request_delegate.h

Index: components/payments/core/payment_request_delegate.h
diff --git a/components/payments/core/payment_request_delegate.h b/components/payments/core/payment_request_delegate.h
index f85997984765f75ebc3adc4069e8ccef35dcfe39..6bbf7d2edecb012ab17e57844364ecc3e1feefae 100644
--- a/components/payments/core/payment_request_delegate.h
+++ b/components/payments/core/payment_request_delegate.h
@@ -74,6 +74,14 @@ class PaymentRequestDelegate {
 
   // 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;
+
+  // Sets the profile pref that represents the first ever transaction being
+  // completed to true.
+  virtual void MarkFirstTransactionAsCompleted() = 0;
 };
 
 }  // namespace payments