[Autofill] Credit Card Autofill Last Used Date Experiment

components/autofill/core/browser/personal_data_manager.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_PERSONAL_DATA_MANAGER_H_
 #define COMPONENTS_AUTOFILL_CORE_BROWSER_PERSONAL_DATA_MANAGER_H_
 
 #include <list>
 #include <memory>
 #include <set>
@@ skipping 202 matching lines @@
   // vector.
   const std::vector<CreditCard*> GetCreditCardsToSuggest() const;
 
   // Gets credit cards that can suggest data for |type|. See
   // GetProfileSuggestions for argument descriptions. The variant in each
   // GUID pair should be ignored.
   std::vector<Suggestion> GetCreditCardSuggestions(
       const AutofillType& type,
       const base::string16& field_contents);
 
+  // Returns the date when the credit card was last used in autofill, show
+  // expiration date if |show_expiration_date| is true, and show time detail
+  // if |show_time_detail| is true.

[Jared Saul, 2017/01/25 18:22:17]

nit, minor wording changes:
   // Returns the date when the credit card was last used in autofill.  Shows
   // expiration date if |show_expiration_date| is true, and shows time detail
   // if |show_time_detail| is true.

[jiahuiguo, 2017/01/26 05:46:13]

Done.

+  base::string16 GetLastUsedDateForDisplay(
+      const CreditCard* credit_card,
+      bool show_expiration_date,
+      bool show_time_detail) const;
+
   // Re-loads profiles and credit cards from the WebDatabase asynchronously.
   // In the general case, this is a no-op and will re-create the same
   // in-memory model as existed prior to the call.  If any change occurred to
   // profiles in the WebDatabase directly, as is the case if the browser sync
   // engine processed a change from the cloud, we will learn of these as a
   // result of this call.
   //
   // Also see SetProfile for more details.
   virtual void Refresh();
 
@@ skipping 313 matching lines @@
   // validation rules.
   scoped_refptr<net::URLRequestContextGetter> context_getter_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(PersonalDataManager);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_PERSONAL_DATA_MANAGER_H_