Commits on Apr 17, 2017

1. Used shared clips for overflow:hidden and CSS clip …

   Instead of passing down a complex clipping region to each item, used
   shared clipping to handle overflow:hidden and CSS clips. In addition to
   being more efficient, this should also fix quite a few issues related
   to absolutely positioned elements.
   
   One existing reftest is slightly modified to avoid tickling a quirk
   with the way that WebRender rasterizes masks. We are working out how to
   best express these combined masks with the API or need to. The change
   does not affect the original subject of the reftest.
   
   Fixes #13109.
   Fixes #10151.
   Fixes #7575.
   Fixes #8074.
   Fixes #8780.

   

   mrobinson committed Apr 17, 2017

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