[Autofill] Uses uniform margin for icon, label and sublabel in popup

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 ccee8c56c7217774babb961a1d4317254ec500bc..777b963e8f34484524673b10c0e6783ae38dbca8 100644
--- a/components/autofill/core/browser/autofill_experiments.cc
+++ b/components/autofill/core/browser/autofill_experiments.cc
@@ -39,6 +39,7 @@ const char kAutofillPopupDropdownItemHeightKey[] =
     "dropdown_item_height";
 const char kAutofillCreditCardPopupIsIconAtStartKey[] =
     "is_credit_card_icon_at_start";
+const char kAutofillPopupMarginKey[] = "margin";
 
 namespace {
 
@@ -128,6 +129,10 @@ void ModifyAutofillCreditCardSuggestion(Suggestion* suggestion) {
   }
 }
 
+unsigned int GetPopupMargin() {
+  return GetCreditCardPopupParameterUintValue(kAutofillPopupMarginKey);
+}
+
 bool OfferStoreUnmaskedCards() {
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
   // The checkbox can be forced on with a flag, but by default we don't store