Autofill: Recognize month/year selects when searching for credit cards.

components/autofill/core/browser/credit_card_field.h

Index: components/autofill/core/browser/credit_card_field.h
diff --git a/components/autofill/core/browser/credit_card_field.h b/components/autofill/core/browser/credit_card_field.h
index 4647f2fc05847aed99e6547eab4a1a52c5e27c5d..2d8ba6f52c2c5cf665bc1a340c69681b8ee98c00 100644
--- a/components/autofill/core/browser/credit_card_field.h
+++ b/components/autofill/core/browser/credit_card_field.h
@@ -31,6 +31,15 @@ class CreditCardField : public FormField {
  private:
   friend class CreditCardFieldTest;
 
+  // Returns true if |scanner| points to a field that looks like a month
+  // <select>.
+  static bool LikelyCardMonthSelectField(AutofillScanner* scanner);
+
+  // Returns true if |scanner| points to a field that looks like a year
+  // <select> for a credit card. i.e. it contains the current year and
+  // the next few years.
+  static bool LikelyCardYearSelectField(AutofillScanner* scanner);
+
   CreditCardField();
 
   // Parses the expiration month/year/date fields. Returns true if it finds