[Autofill] Fix heuristics to detect consecutive CVCs.

components/autofill/core/browser/credit_card_field.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_CREDIT_CARD_FIELD_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_CREDIT_CARD_FIELD_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 41 matching lines @@
 
   // Parses the expiration month/year/date fields. Returns true if it finds
   // something new.
   bool ParseExpirationDate(AutofillScanner* scanner);
 
   // For the combined expiration field we return |exp_year_type_|; otherwise if
   // |expiration_year_| is having year with |max_length| of 2-digits we return
   // |CREDIT_CARD_EXP_2_DIGIT_YEAR|; otherwise |CREDIT_CARD_EXP_4_DIGIT_YEAR|.
   ServerFieldType GetExpirationYearType() const;
 
+  // Returns whether the expiration has been set for this credit card field.
+  // It can be either a date or both the month and the year.
+  bool HasExpiration() const;
+
   AutofillField* cardholder_;  // Optional.
 
   // Occasionally pages have separate fields for the cardholder's first and
   // last names; for such pages |cardholder_| holds the first name field and
   // we store the last name field here.
   // (We could store an embedded |NameField| object here, but we don't do so
   // because the text patterns for matching a cardholder name are different
   // than for ordinary names, and because cardholder names never have titles,
   // middle names or suffixes.)
   AutofillField* cardholder_last_;
@@ skipping 14 matching lines @@
   // |CREDIT_CARD_EXP_DATE_2_DIGIT_YEAR|; otherwise we store
   // |CREDIT_CARD_EXP_DATE_4_DIGIT_YEAR|.
   ServerFieldType exp_year_type_;
 
   DISALLOW_COPY_AND_ASSIGN(CreditCardField);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_CREDIT_CARD_FIELD_H_