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hintPassthroughNames
Non-standard parameter hints can be passed from args file through to an Op using shader parameter info mechanism (PRManAddShaderParameterInfoOp) and the hintPassthroughNames list. Parameter hint names specified in this list are available to Ops configured using insertWhen=afterAddShaderInfo. 

outputTagPassthroughNames
Non-standard per-shader, per-output tags can be passed from args file through to an Op using shader parameter info mechanism (PRManAddShaderParameterInfoOp) and the outputTagPassthroughNames list. Output tag names specified in this list are available to Ops configured using insertWhen=afterAddShaderInfo.