Commits on Mar 14, 2017

1. Remove ServoScrollRootId …

   Remove the concept of ServoScrollRootId and just wrap up external ids
   into ScrollLayerId. This will allow API clients to specify ids without
   having to do complicated bookkeeping when building display lists. In
   addition, this makes the code much simpler. This is a major API break
   because clips cannot share the same id. This is only possible because
   now Servo does not need to split scroll layers / clips.

   

   mrobinson committed Mar 14, 2017

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