Commits on Feb 16, 2018

1. Convert ClipIds for Clips into indices in the ClipScrollTree …

   During display list flattening, we convert ClipIds for the clipping node
   into ClipChainIndex (as well as allocating space for them in the
   ClipChain array in the ClipScrollTree). This allows us to avoid doing a
   HashMap lookup for the ClipChain for every primitive run. It also moves
   us a little closer to a universal representation of ClipChains (both
   API-defined ClipChains and ones derived from the hierarchy of the
   ClipScroll tree).
   
   This causes the amount of time spend doing HashMap lookups to decrease
   in the profile, though they are still done for the positioning node. A
   second patch will reduce HashMap lookups for positioning nodes as well.

   

   mrobinson committed Feb 16, 2018

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