if ([scroller_ respondsToSelector:@selector(setScrollerIndicatorSubrect:)])
[scroller_ setScrollerIndicatorSubrect:subrect];
- [document_ setValue:[NSValue valueWithSize:NSMakeSize(subrect.size.width, subrect.size.height)] forGestureAttribute:UIGestureAttributeVisibleSize];
+ [document_ setValue:[NSValue valueWithSize:CGSizeMake(subrect.size.width, subrect.size.height)] forGestureAttribute:UIGestureAttributeVisibleSize];
CGSize size(size_);
size.height += extra;