[Payments] Show what's missing for incomplete payment methods.

components/payments/content/payment_request_state.cc

Index: components/payments/content/payment_request_state.cc
diff --git a/components/payments/content/payment_request_state.cc b/components/payments/content/payment_request_state.cc
index 959ee9415f0fe604f25554f29c4a7d7119cc7fed..47f8e0c0e3e1d136a814c2383952d566c615d64e 100644
--- a/components/payments/content/payment_request_state.cc
+++ b/components/payments/content/payment_request_state.cc
@@ -179,11 +179,11 @@ void PaymentRequestState::SetDefaultProfileSelections() {
   // value.
   const std::vector<std::unique_ptr<PaymentInstrument>>& instruments =
       available_instruments();
-  auto first_complete_instrument =
-      std::find_if(instruments.begin(), instruments.end(),
-                   [](const std::unique_ptr<PaymentInstrument>& instrument) {
-                     return instrument->IsCompleteForPayment();
-                   });
+  auto first_complete_instrument = std::find_if(
+      instruments.begin(), instruments.end(),
+      [](const std::unique_ptr<PaymentInstrument>& instrument) {
+        return instrument->IsCompleteForPayment(/*missing_info=*/nullptr);
+      });
 
   selected_instrument_ = first_complete_instrument == instruments.end()
                              ? nullptr
@@ -207,7 +207,7 @@ bool PaymentRequestState::ArePaymentDetailsSatisfied() {
   // There is no need to check for supported networks, because only supported
   // instruments are listed/created in the flow.
   return selected_instrument_ != nullptr &&
-         selected_instrument_->IsCompleteForPayment();
+         selected_instrument_->IsCompleteForPayment(/*missing_info=*/nullptr);
 }
 
 bool PaymentRequestState::ArePaymentOptionsSatisfied() {