isabellekim 2997b6995f Add shadow compat support for cut corners and triangle edge treatments, updating ShapePath to add extra shadow arcs when needed:
+ Updates LineShadowOperation to call drawEdgeShadow with a horizontal edge
+ ShapePath has a start & end shadow angle and will add shadow arcs to fill in gaps between shadow operations

PiperOrigin-RevId: 219686107
2018-11-01 16:22:14 -07:00
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