code: @NonNull
      public IconicsDrawable backgroundContourColor(@NonNull ColorStateList colors) {
          if (colors != null) {
              mBackgroundContourBrush.setColors(colors);
              if (mBackgroundContourBrush.applyState(getState())) {
                  invalidateSelf();
              }
          }
          return this;
      }
docs: Set background contour colors.
  
  @return The current IconicsDrawable for chaining.