[Autofill] Add upstreaming UKM

components/autofill/core/browser/autofill_experiments.cc

Index: components/autofill/core/browser/autofill_experiments.cc
diff --git a/components/autofill/core/browser/autofill_experiments.cc b/components/autofill/core/browser/autofill_experiments.cc
index 8e0c3a7458d3469ddec034d88db86af5e04e76b7..b27569f4d8cb2484834f5da1b0e3267be703ea36 100644
--- a/components/autofill/core/browser/autofill_experiments.cc
+++ b/components/autofill/core/browser/autofill_experiments.cc
@@ -32,6 +32,8 @@ const base::Feature kAutofillCreditCardPopupLayout{
     "AutofillCreditCardPopupLayout", base::FEATURE_DISABLED_BY_DEFAULT};
 const base::Feature kAutofillCreditCardLastUsedDateDisplay{
     "AutofillCreditCardLastUsedDateDisplay", base::FEATURE_DISABLED_BY_DEFAULT};
+const base::Feature kAutofillUkmLogging{"kAutofillUkmLogging",
+                                        base::FEATURE_DISABLED_BY_DEFAULT};
 const char kCreditCardSigninPromoImpressionLimitParamKey[] = "impression_limit";
 const char kAutofillCreditCardPopupBackgroundColorKey[] = "background_color";
 const char kAutofillCreditCardPopupDividerColorKey[] = "dropdown_divider_color";
@@ -223,4 +225,8 @@ bool IsCreditCardUploadEnabled(const PrefService* pref_service,
   return !group_name.empty() && group_name != "Disabled";
 }
 
+bool IsUkmLoggingEnabled() {
+  return base::FeatureList::IsEnabled(kAutofillUkmLogging);
+}
+
 }  // namespace autofill