docs: public void setupUpIndicator(Activity activity) {
          if (mActionBarHelper == null) {
              mActionBarHelper = new ActionBarHelper(activity);
              mThemeUpIndicator = mActionBarHelper.getThemeUpIndicator();
  
              if (mDrawerIndicatorEnabled) {
                  mActionBarHelper.setActionBarUpIndicator(mSlideDrawable,
                          isMenuVisible() ? mDrawerOpenContentDesc : mDrawerClosedContentDesc);
              }
          }
      }