@Override
    public Parcelable onSaveInstanceState(CoordinatorLayout parent, V child) {
        return new SavedState(super.onSaveInstanceState(parent, child), mState);
    }
Default constructor for inflating ViewPagerBottomSheetBehaviors from layout.

@param context The {@link Context}.
@param attrs   The {@link AttributeSet}.
vpbs/src/main/java/biz/laenger/android/vpbs/ViewPagerBottomSheetBehavior.java