[Autofill] Add upstreaming UKM

components/autofill/core/browser/autofill_experiments.h

Index: components/autofill/core/browser/autofill_experiments.h
diff --git a/components/autofill/core/browser/autofill_experiments.h b/components/autofill/core/browser/autofill_experiments.h
index 4f9a86aa2dff2e07a5090a39350928bb75274dee..70c3f411c605496178ac508773e6549cf4d5d050 100644
--- a/components/autofill/core/browser/autofill_experiments.h
+++ b/components/autofill/core/browser/autofill_experiments.h
@@ -28,6 +28,7 @@ extern const base::Feature kAutofillCreditCardAssist;
 extern const base::Feature kAutofillScanCardholderName;
 extern const base::Feature kAutofillCreditCardPopupLayout;
 extern const base::Feature kAutofillCreditCardLastUsedDateDisplay;
+extern const base::Feature kAutofillUkmLogging;
 extern const char kCreditCardSigninPromoImpressionLimitParamKey[];
 extern const char kAutofillCreditCardPopupSettingsSuggestionValueKey[];
 extern const char kAutofillCreditCardLastUsedDateShowExpirationDateKey[];
@@ -100,6 +101,9 @@ void ModifyAutofillCreditCardSuggestion(struct Suggestion* suggestion);
 // layout.
 unsigned int GetPopupMargin();
 
+// Returns whether the feature to log UKMs is enabled.
+bool IsUkmLoggingEnabled();
+
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_AUTOFILL_EXPERIMENTS_H_