Commits on Nov 4, 2016

1. Support for non-stacking-context scrolling areas …

   When we encounter a stacking context which scrolls its contents, we
   treat it as a special non-stacking-context scrolling area. All
   scrolling areas with the same servo scroll root id will be scrolled in
   tandem. Later changes will give these fake stacking contexts their own
   display item.

   

   mrobinson committed Nov 4, 2016

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