afohrman c6b554555b Use deep copies for CornerTreatment and EdgeTreatment convenience methods in
ShapeAppearanceModel.

Prior to this change, ShapeAppearanceModel#setAllCorners() and
ShapeAppearanceModel#setAllEdges() set all four corners or edges to the same
CornerTreatment or EdgeTreatment. This change creates deep copies for each
corner/edge treatment to avoid bugs caused by silently reusing the mutable
object.

PiperOrigin-RevId: 222413898
2018-12-06 11:19:04 -05:00
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