NEW 190380
FrameView::scrollOffsetChangedViaPlatformWidgetImpl() should call scrollPositionChanged() before updating layers 
https://bugs.webkit.org/show_bug.cgi?id=190380
Summary FrameView::scrollOffsetChangedViaPlatformWidgetImpl() should call scrollPosit...
Simon Fraser (smfr)
Reported 2018-10-08 16:36:36 PDT
scrollPositionChanged() sets the layout viewport origin, which is needed during layer tree traversal to set the composting layer positions.
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