PaymentHandler: Implement PaymentInstruments.has().

content/browser/payments/payment_manager.cc

 // 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.
 
 #include "content/browser/payments/payment_manager.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/optional.h"
@@ skipping 58 matching lines @@
 void PaymentManager::SetPaymentInstrument(
     const std::string& instrument_key,
     payments::mojom::PaymentInstrumentPtr details,
     const PaymentManager::SetPaymentInstrumentCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   payment_app_context_->payment_app_database()->WritePaymentInstrument(
       scope_, instrument_key, std::move(details), callback);
 }
 
+void PaymentManager::HasPaymentInstrument(
+    const std::string& instrument_key,
+    const HasPaymentInstrumentCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  payment_app_context_->payment_app_database()->HasPaymentInstrument(
+      scope_, instrument_key, callback);
+}
+
 void PaymentManager::GetPaymentInstrument(
     const std::string& instrument_key,
     const PaymentManager::GetPaymentInstrumentCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   payment_app_context_->payment_app_database()->ReadPaymentInstrument(
       scope_, instrument_key, callback);
 }
 
 void PaymentManager::OnConnectionError() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   payment_app_context_->PaymentManagerHadConnectionError(this);
 }
 
 }  // namespace content