Reorgnize the platform-specific files

atom/browser/mac/in_app_purchase_observer.h

@@ -0,0 +1,41 @@
+// Copyright (c) 2017 Amaplex Software, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_MAC_IN_APP_PURCHASE_OBSERVER_H_
+#define ATOM_BROWSER_MAC_IN_APP_PURCHASE_OBSERVER_H_
+
+#include <string>
+
+#include "base/callback.h"
+
+namespace in_app_purchase {
+
+// --------------------------- Structures ---------------------------
+
+struct Payment {
+  std::string productIdentifier = "";
+  int quantity = 1;
+};
+
+struct Transaction {
+  std::string transactionIdentifier = "";
+  std::string transactionDate = "";
+  std::string originalTransactionIdentifier = "";
+  int errorCode = 0;
+  std::string errorMessage = "";
+  std::string transactionState = "";
+};
+
+// --------------------------- Typedefs ---------------------------
+
+typedef base::RepeatingCallback<void(const Payment, const Transaction)>
+    InAppTransactionCallback;
+
+// --------------------------- Functions ---------------------------
+
+void AddTransactionObserver(const InAppTransactionCallback& callback);
+
+}  // namespace in_app_purchase
+
+#endif  // ATOM_BROWSER_MAC_IN_APP_PURCHASE_OBSERVER_H_