Commits on Jun 23, 2017

1. Remove the per-item complex clipping and masking from the API …

   This is the first step to getting all masking operations into the
   ClipScrollTree. We don't completely this feature, as it's still sued
   for the extra clips. These will be moved into the ClipScrollTree in a
   later change. This change allows us to fully eliminate the
   DisplayListBuilder::push_clip_region API and push its functionality
   into the define_clip API.
   
   Most of the changes here are:
     1. Changes to the examples, wrench, and reftests to match the new API.
     2. Adapting the "split rectangle clipped by rounded rect"
        optimization to use the ClipScrollTree. This is unfortunately a
        bit more complicated now, but now includes any rounded rect clip
        instead of per-item ones.

   

   mrobinson committed Jun 23, 2017

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