Commits on Jan 8, 2016

1. Use DisplayListSection everywhere …

   DisplayListSection, StackingLevel, and BackgroundAndBorderLevel all
   represent pretty much the same thing, a particular section of the
   display list. Instead of maintaining three enums which do the same
   thing, just use DisplayListSection everywhere. It's a superset of the
   other two and this change will make it easier to flatten the DisplayList
   in the future for WebRender.

   

   mrobinson committed Jan 8, 2016

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