[Web Payments] Common Payments validation

components/payments/payment_details_validation.h

+// 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.
+
+#ifndef COMPONENTS_PAYMENTS_PAYMENT_DETAILS_VALIDATION_H_
+#define COMPONENTS_PAYMENTS_PAYMENT_DETAILS_VALIDATION_H_
+
+#include <string>
+
+#include "components/payments/payment_request.mojom.h"
+
+namespace payments {
+
+struct ExceptionState {
+ public:
+  void throwTypeError(const std::string& msg) { msg_ = msg; }
+
+  bool hadException() { return msg_.size() > 0; }
+
+  const std::string& message() { return msg_; }
+
+ private:
+  std::string msg_;
+};
+
+void validatePaymentDetails(const blink::mojom::PaymentDetailsPtr& details,
+                            ExceptionState* state);
+bool validatePaymentDetails(const blink::mojom::PaymentDetailsPtr& details);

[please use gerrit instead, 2016/10/27 17:14:25]

Instead of recreating the ExceptionState concept from Blink, let's use a pointer
to an optional std::string error message and return a boolean that indicates
validity.

bool validatePaymentDetails(
    const blink::mojom::PaymentDetailsPtr& details,
    std::string* optional_error_message);

[Kevin Bailey, 2016/10/27 22:17:53]

Done.

+
+}  // namespace payments
+
+#endif  // COMPONENTS_PAYMENTS_PAYMENT_DETAILS_VALIDATION_H_