Autofill: Set requirements for number of recognized fields in an autofillable form

components/autofill/core/browser/credit_card_field.cc

 // 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.
 
 #include "components/autofill/core/browser/credit_card_field.h"
 
 #include <stddef.h>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
@@ skipping 225 matching lines @@
         ok && AddClassification(expiration_date_, GetExpirationYearType(), map);
   } else {
     ok = ok && AddClassification(expiration_month_, CREDIT_CARD_EXP_MONTH, map);
     ok =
         ok && AddClassification(expiration_year_, GetExpirationYearType(), map);
   }
 
   return ok;
 }
 
+size_t CreditCardField::FieldCount() const {
+  size_t count = 0;
+
+  if (cardholder_)
+    ++count;
+  if (cardholder_last_)
+    ++count;
+  if (type_)
+    ++count;
+  count += numbers_.size();

[Evan Stade, 2015/01/21 22:52:49]

this should probably be

if (!numbers_.empty())
  ++count;

[Lei Zhang, 2015/01/22 08:07:36]

Done.

+  if (verification_)
+    ++count;
+  if (expiration_month_)
+    ++count;
+  if (expiration_year_)
+    ++count;
+  if (expiration_date_)
+    ++count;
+
+  return count;;
+}
+
 ServerFieldType CreditCardField::GetExpirationYearType() const {
   return (expiration_date_
               ? exp_year_type_
               : ((expiration_year_ && expiration_year_->max_length == 2)
                      ? CREDIT_CARD_EXP_2_DIGIT_YEAR
                      : CREDIT_CARD_EXP_4_DIGIT_YEAR));
 }
 
 }  // namespace autofill