[Payment Request] Displays Contact Info in the payment summary view

ios/chrome/browser/payments/payment_request_util.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 IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_UTIL_H_
 #define IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_UTIL_H_
 
 #import <Foundation/Foundation.h>
 
 #include "ios/web/public/payments/payment_request.h"
 
 namespace autofill {
 class AutofillProfile;
 }  // namespace autofill
 
 class PaymentRequest;
 
 namespace payment_request_util {
 
-// Helper function to get the name label from an autofill profile.
-NSString* NameLabelFromAutofillProfile(autofill::AutofillProfile* profile);
+// Helper function to get the name label from an autofill profile. Returns nil
+// if the name field is empty.
+NSString* GetNameLabelFromAutofillProfile(autofill::AutofillProfile* profile);
 
-// Helper function to get the address label from an autofill profile.
-NSString* AddressLabelFromAutofillProfile(autofill::AutofillProfile* profile);
+// Helper function to get the address label from an autofill profile. Returns
+// nil if the address field is empty.
+NSString* GetAddressLabelFromAutofillProfile(
+    autofill::AutofillProfile* profile);
 
 // Helper function to get the phone number label from an autofill profile.
-NSString* PhoneNumberLabelFromAutofillProfile(
+// Returns nil if the phone number field is empty.
+NSString* GetPhoneNumberLabelFromAutofillProfile(
     autofill::AutofillProfile* profile);
 
+// Helper function to get the email label from an autofill profile. Returns nil
+// if the email field is empty.
+NSString* GetEmailLabelFromAutofillProfile(autofill::AutofillProfile* profile);
+
 // Helper function to get an instance of web::PaymentAddress from an autofill
 // profile.
-web::PaymentAddress PaymentAddressFromAutofillProfile(
+web::PaymentAddress GetPaymentAddressFromAutofillProfile(
     autofill::AutofillProfile* profile);
 
 // Returns the title for the shipping section of the payment summary view given
 // the shipping type specified in |payment_request|.
 NSString* GetShippingSectionTitle(PaymentRequest* payment_request);
 
 // Returns the title for the shipping address selection view given the shipping
 // type specified in |payment_request|.
 NSString* GetShippingAddressSelectorTitle(PaymentRequest* payment_request);
 
@@ skipping 10 matching lines @@
 // type specified in |payment_request|.
 NSString* GetShippingOptionSelectorTitle(PaymentRequest* payment_request);
 
 // Returns the error message to be displayed in the shipping option selection
 // view given the shipping type specified in |payment_request|.
 NSString* GetShippingOptionSelectorErrorMessage(PaymentRequest* paymentRequest);
 
 }  // namespace payment_request_util
 
 #endif  // IOS_CHROME_BROWSER_PAYMENTS_PAYMENT_REQUEST_UTIL_H_