protected void dispatchOnDrawerSlide(float openRatio, int offsetPixels) {
        if (mOnDrawerStateChangeListener != null) {
            mOnDrawerStateChangeListener.onDrawerSlide(openRatio, offsetPixels);
        }
    }
Returns the size of the touch bezel in px.
menudrawer/src/net/simonvt/menudrawer/MenuDrawer.java