PaymentHandler: Implement PaymentInstruments.has().

content/browser/payments/payment_app_database.cc

Index: content/browser/payments/payment_app_database.cc
diff --git a/content/browser/payments/payment_app_database.cc b/content/browser/payments/payment_app_database.cc
index dc13182222da6f78f0c3cd34f06bd04a693076de..324bdcea6e186245d97cc90fa7205c0538c12e59 100644
--- a/content/browser/payments/payment_app_database.cc
+++ b/content/browser/payments/payment_app_database.cc
@@ -135,6 +135,19 @@ void PaymentAppDatabase::ReadPaymentInstrument(
           base::Passed(std::move(callback))));
 }
 
+void PaymentAppDatabase::HasPaymentInstrument(
+    const GURL& scope,
+    const std::string& instrument_key,
+    HasPaymentInstrumentCallback callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  service_worker_context_->FindReadyRegistrationForPattern(
+      scope,
+      base::Bind(&PaymentAppDatabase::DidFindRegistrationToHasPaymentInstrument,
+                 weak_ptr_factory_.GetWeakPtr(), instrument_key,
+                 base::Passed(std::move(callback))));
+}
+
 void PaymentAppDatabase::WritePaymentInstrument(
     const GURL& scope,
     const std::string& instrument_key,
@@ -349,6 +362,39 @@ void PaymentAppDatabase::DidReadPaymentInstrument(
   std::move(callback).Run(std::move(instrument), PaymentHandlerStatus::SUCCESS);
 }
 
+void PaymentAppDatabase::DidFindRegistrationToHasPaymentInstrument(
+    const std::string& instrument_key,
+    HasPaymentInstrumentCallback callback,
+    ServiceWorkerStatusCode status,
+    scoped_refptr<ServiceWorkerRegistration> registration) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  if (status != SERVICE_WORKER_OK) {
+    std::move(callback).Run(PaymentHandlerStatus::NO_ACTIVE_WORKER);
+    return;
+  }
+
+  service_worker_context_->GetRegistrationUserData(
+      registration->id(), {instrument_key},
+      base::Bind(&PaymentAppDatabase::DidHasPaymentInstrument,
+                 weak_ptr_factory_.GetWeakPtr(), registration->id(),
+                 instrument_key, base::Passed(std::move(callback))));
+}
+
+void PaymentAppDatabase::DidHasPaymentInstrument(
+    int64_t registration_id,
+    const std::string& instrument_key,
+    DeletePaymentInstrumentCallback callback,
+    const std::vector<std::string>& data,
+    ServiceWorkerStatusCode status) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  if (status != SERVICE_WORKER_OK || data.size() != 1) {
+    std::move(callback).Run(PaymentHandlerStatus::NOT_FOUND);
+    return;
+  }
+
+  std::move(callback).Run(PaymentHandlerStatus::SUCCESS);
+}
+
 void PaymentAppDatabase::DidFindRegistrationToWritePaymentInstrument(
     const std::string& instrument_key,
     PaymentInstrumentPtr instrument,