GafferArnoldTest : Update for new Expression API.
GafferArnoldTest : Update for new Expression API.

GafferHQ/gaffer,lucienfostier/gaffer,ivanimanishi/gaffer,lucienfostier/gaffer,chippey/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,ImageEngine/gaffer,chippey/gaffer,boberfly/gaffer,ImageEngine/gaffer,hradec/gaffer,johnhaddon/gaffer,appleseedhq/gaffer,hradec/gaffer,boberfly/gaffer,johnhaddon/gaffer,boberfly/gaffer,ivanimanishi/gaffer,andrewkaufman/gaffer,boberfly/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,ivanimanishi/gaffer,lucienfostier/gaffer,appleseedhq/gaffer,hradec/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,chippey/gaffer,GafferHQ/gaffer,lucienfostier/gaffer,ivanimanishi/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,chippey/gaffer,GafferHQ/gaffer,hradec/gaffer,hradec/gaffer