PaymentHandler: Implement GetAllPaymentApps().

content/browser/payments/payment_app_database.h

Index: content/browser/payments/payment_app_database.h
diff --git a/content/browser/payments/payment_app_database.h b/content/browser/payments/payment_app_database.h
index 9155f4f8c5748090c44ae8487cb4e7775390208d..dfd9796c2176b277d3518e7fb9e5cb3ac3596f7e 100644
--- a/content/browser/payments/payment_app_database.h
+++ b/content/browser/payments/payment_app_database.h
@@ -32,6 +32,11 @@ class CONTENT_EXPORT PaymentAppDatabase {
       std::pair<int64_t, payments::mojom::PaymentAppManifestPtr>;
   using Manifests = std::vector<ManifestWithID>;
   using ReadAllManifestsCallback = base::Callback<void(Manifests)>;
+
+  using Instruments = std::vector<payments::mojom::PaymentInstrumentPtr>;
+  using PaymentApps = std::map<GURL, Instruments>;
+  using ReadAllPaymentAppsCallback = base::OnceCallback<void(PaymentApps)>;
+
   using DeletePaymentInstrumentCallback =
       base::OnceCallback<void(payments::mojom::PaymentHandlerStatus)>;
   using ReadPaymentInstrumentCallback =
@@ -56,6 +61,9 @@ class CONTENT_EXPORT PaymentAppDatabase {
                      const WriteManifestCallback& callback);
   void ReadManifest(const GURL& scope, const ReadManifestCallback& callback);
   void ReadAllManifests(const ReadAllManifestsCallback& callback);
+
+  void ReadAllPaymentApps(ReadAllPaymentAppsCallback callback);
+
   void DeletePaymentInstrument(const GURL& scope,
                                const std::string& instrument_key,
                                DeletePaymentInstrumentCallback callback);
@@ -99,6 +107,12 @@ class CONTENT_EXPORT PaymentAppDatabase {
       const std::vector<std::pair<int64_t, std::string>>& raw_data,
       ServiceWorkerStatusCode status);
 
+  // ReadAllPaymentApps callbacks
+  void DidReadAllPaymentApps(
+      ReadAllPaymentAppsCallback callback,
+      const std::vector<std::pair<int64_t, std::string>>& raw_data,
+      ServiceWorkerStatusCode status);
+
   // DeletePaymentInstrument callbacks
   void DidFindRegistrationToDeletePaymentInstrument(
       const std::string& instrument_key,