Implement request id in PaymentDetailsInit

third_party/WebKit/Source/modules/payments/PaymentRequest.h

Index: third_party/WebKit/Source/modules/payments/PaymentRequest.h
diff --git a/third_party/WebKit/Source/modules/payments/PaymentRequest.h b/third_party/WebKit/Source/modules/payments/PaymentRequest.h
index f3c13197dccb96aa586e5ba6dcf85a9e084b1cb7..a36b56bc1377c8908d0211f181fb5fe73194827e 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentRequest.h
+++ b/third_party/WebKit/Source/modules/payments/PaymentRequest.h
@@ -61,6 +61,7 @@ class MODULES_EXPORT PaymentRequest final
   ScriptPromise show(ScriptState*);
   ScriptPromise abort(ScriptState*);
 
+  const String& id() const { return id_; }
   PaymentAddress* getShippingAddress() const { return shipping_address_.Get(); }
   const String& shippingOption() const { return shipping_option_; }
   const String& shippingType() const { return shipping_type_; }
@@ -116,6 +117,7 @@ class MODULES_EXPORT PaymentRequest final
 
   PaymentOptions options_;
   Member<PaymentAddress> shipping_address_;
+  String id_;
   String shipping_option_;
   String shipping_type_;
   Member<ScriptPromiseResolver> show_resolver_;