Commits on Oct 24, 2015

1. Mix stacking contexts into the positioned content list …

   Sometimes positioned content needs to be layered on top of stacking
   contexts. The layer synthesis code can do this, but the current design
   prevents it because stacking contexts are stored in a separate struct
   member. In order to preserve tree order, mix stacking contexts into the
   positioned content list, by adding a new StackingContextClass
   DisplayItem. Such items do not have a base DisplayItem.
   
   In some ways this simplifies the code, because we no longer have to
   have a separate code path in the StackingContextLayerCreator.

   

   mrobinson committed Oct 24, 2015

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