Prevent overflow of width/height of layout overflow rectangle which can cause scroll bar to misfunction
https://bugs.webkit.org/show_bug.cgi?id=121041

Reviewed by Darin Adler.

Merge the test from https://chromium.googlesource.com/chromium/blink/+/d050f9be579d02e40c8924b4153376bc32ffba1a

* scrollbars/scrollbar-large-overflow-rectangle-expected.txt: Added.
* scrollbars/scrollbar-large-overflow-rectangle.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@155394 268f45cc-cd09-0410-ab3c-d52691b4dbfc