Commits on Oct 18, 2017

1. Fix duplicate stacking context creation for anonymous Flows …

   Anonymous nodes were previously creating duplicate stacking contexts,
   one for each node in the anonymous node chain. This change eliminates
   that for tables.
   
   Additionally the use of stacking context ids based on node addresses is
   no longer necessary since stacking contexts no longer control scrolling.
   This is the first step in eliminating the dependency between node
   addresses and ClipScrollNodes which causes issues like #16425.

   

   mrobinson committed Oct 18, 2017

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