code: @VisibleForTesting
      static boolean shouldIconShowBrand(
              @NonNull @Card.CardBrand String brand,
              boolean cvcHasFocus,
              @Nullable String cvcText) {
          if (!cvcHasFocus) {
              return true;
          }
          return ViewUtils.isCvcMaximalLength(brand, cvcText);
      }
docs: Determines whether or not the icon should show the card brand instead of the
  CVC helper icon.
  
  @param brand the {@link CardBrand} in question, used for determining max length
  @param cvcHasFocus {@code true} if the CVC entry field has focus, {@code false} otherwise
  @param cvcText the current content of {@link #mCvcNumberEditText}
  @return {@code true} if we should show the brand of the card, or {@code false} if we
  should show the CVC helper icon instead