Commits on Oct 20, 2015

1. Integrate iframes into the display list …

   Instead of always promoting iframes to StackingContexts, integrate them
   into the display list. This prevents stacking bugs when
   non-stacking-context elements should be drawn on top of iframes.
   
   To accomplish this, we add another step to ordering layer creation,
   where LayeredItems in the DisplayList are added to layers described by
   the LayerInfo structures collected at the end of the DisplayList.
   Unlayered items that follow these layered items are added to
   synthesized layers.
   
   Another result of this change is that iframe layers can be positioned
   directly at the location of the iframe fragment, eliminating the need
   for the SubpageLayerInfo struct entirely.
   
   Iframes are the first type of content treated this way, but this change
   opens up the possibility to properly order canvas and all other layered
   content that does not create a stacking context.
   
   Fixes #7566.
   Fixes #7796.

   

   mrobinson committed Oct 20, 2015

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