Logs different SaveCardPrompt histogram names depending on if user

components/autofill/core/common/autofill_pref_names.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_COMMON_AUTOFILL_PREF_NAMES_H_
 #define COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_PREF_NAMES_H_
 
 namespace autofill {
 namespace prefs {
 
 // Alphabetical list of preference names specific to the Autofill
 // component. Keep alphabetized, and document each in the .cc file.
 
+extern const char kAutofillAcceptSaveCreditCardPromptState[];
 extern const char kAutofillCreditCardSigninPromoImpressionCount[];
 extern const char kAutofillEnabled[];
 extern const char kAutofillProfileUseDatesFixed[];
 extern const char kAutofillLastVersionDeduped[];
 extern const char kAutofillWalletImportEnabled[];
 extern const char kAutofillWalletImportStorageCheckboxState[];
 
+// Possible values for previous user decision when we displayed a save credit
+// card prompt.
+enum PreviousSaveCreditCardPromptUserDecision {
+  PREVIOUS_SAVE_CREDIT_CARD_PROMPT_USER_DECISION_NONE,
+  PREVIOUS_SAVE_CREDIT_CARD_PROMPT_USER_DECISION_ACCEPTED,
+  PREVIOUS_SAVE_CREDIT_CARD_PROMPT_USER_DECISION_DENIED,
+  NUM_PREVIOUS_SAVE_CREDIT_CARD_PROMPT_USER_DECISIONS
+};
+
 }  // namespace prefs
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_COMMON_AUTOFILL_PREF_NAMES_H_