docs: public void setDrawerIndicatorEnabled(boolean enabled) {
          if (mActionBarHelper == null) {
              throw new IllegalStateException("setupUpIndicator(Activity) has not been called");
          }
  
          mDrawerIndicatorEnabled = enabled;
          if (enabled) {
              mActionBarHelper.setActionBarUpIndicator(mSlideDrawable,
                      isMenuVisible() ? mDrawerOpenContentDesc : mDrawerClosedContentDesc);
          } else {
              mActionBarHelper.setActionBarUpIndicator(mThemeUpIndicator, 0);
          }
      }