Commits on Jul 7, 2017

1. Treat all clips as scroll frames (partial revert of #1412) …

   PR #1412 introduced a small semantic change mixed in with the removal of
   per-item complex clipping and masking. The semantic change resulted in
   numerous Gecko reftest failures as many scroll frames ended up being
   treated as clips. Eventually WR will have an explicit API to allow
   callers to distinguish scroll frames from clips, but until that is in
   place we should maintain the old behaviour of just treating all clips as
   potential scroll frames.

   

   staktrace committed Jul 7, 2017

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