James Robinson eef941140f Handle a picture in a TextureLayer with an empty cull rect
If we have a layer with a picture where the cull rect computes down to an empty
rectangle attempting to rasterize it into a ganesh surface will fail in the
same manner that trying to ganesh rasterize an empty layer will. This teaches
LayerHost to check for this case and handle it like an empty layer.

Fixes #1337
2015-09-28 18:22:52 -07:00
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