[Win] Scrolling should not repaint dirty region. 
https://bugs.webkit.org/show_bug.cgi?id=193542
Summary [Win] Scrolling should not repaint dirty region.
Per Arne Vollan
Reported 2019-01-17 11:22:27 PST
The patch in https://bugs.webkit.org/show_bug.cgi?id=173152 fixes repaint glitches when scrolling on systems with non-integral device scale factors. The patch repaints the dirty region, which is suboptimal. This should be fixed.
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