Commits on Jan 5, 2015

1. layout: Paint stacking contexts' overflow areas properly. …

   This was making `box-shadow` not show up in many cases, in particular,
   but the effects were not limited to that.

   

   pcwalton committed Jan 5, 2015
   5ea2c6d

2. layout: Explicitly thread border box dimensions and relative offsets …

   through display list building.
   
   The old `flow_origin` concept was ill-defined (sometimes the border box
   plus the flow origin, sometimes including horizontal margins and
   sometimes not, sometimes including relative position and sometimes not),
   leading to brittleness and test failures. This commit reworks the logic
   to always pass border box origins in during display list building.

   

   pcwalton committed Jan 5, 2015

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