[Autofill] Credit Card Autofill Last Used Date Experiment

components/autofill/core/browser/personal_data_manager.h

Index: components/autofill/core/browser/personal_data_manager.h
diff --git a/components/autofill/core/browser/personal_data_manager.h b/components/autofill/core/browser/personal_data_manager.h
index 165862f6217518bff5f95af87b69482ab26cafff..ecf81758b0424384c2beff15a4157aea83d4aca4 100644
--- a/components/autofill/core/browser/personal_data_manager.h
+++ b/components/autofill/core/browser/personal_data_manager.h
@@ -220,6 +220,14 @@ class PersonalDataManager : public KeyedService,
       const AutofillType& type,
       const base::string16& field_contents);
 
+  // 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.
+  base::string16 GetLastUsedDateForDisplay(

[jungshik at Google, 2017/01/26 19:29:14]

Does this need to be public? Can it be just a static helper inside an anonymous
namespace in cc file? 

[jiahuiguo, 2017/01/27 09:31:05]

Done.

+      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