[Payments] Basic validation in the credit card editor.

components/autofill/core/browser/validation.h

 // Copyright 2013 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_AUTOFILL_CORE_BROWSER_VALIDATION_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_VALIDATION_H_
 
 #include "base/strings/string16.h"
 #include "base/strings/string_piece.h"
+#include "components/autofill/core/browser/field_types.h"
 
 namespace base {
 class Time;
 }  // namespace base
 
 namespace autofill {
 
 // Returns true if |year| and |month| describe a date later than |now|.
 // |year| must have 4 digits.
 bool IsValidCreditCardExpirationDate(int year,
@@ skipping 16 matching lines @@
 // case insensitive.  Valid for US states only.
 bool IsValidState(const base::string16& text);
 
 // Returns true if |text| looks like a valid zip code.
 // Valid for US zip codes only.
 bool IsValidZip(const base::string16& text);
 
 // Returns true if |text| looks like an SSN, with or without separators.
 bool IsSSN(const base::string16& text);
 
+// Returns whether |value| is valid for the given |type|. If not null,
+// |error_message| is populated when the function returns false.
+bool IsValidForType(const base::string16& value,
+                    ServerFieldType type,
+                    base::string16* error_message);
+
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_VALIDATION_H_