Minor change to API to make useful method public.
Minor change to API to make useful method public.

Change-Id: I2fc39a7b7ecfd2cfe27c6bcd2d77d2daa80fc91a

keithroe/vtkoptix,gram526/VTK,msmolens/VTK,candy7393/VTK,gram526/VTK,hendradarwin/VTK,sankhesh/VTK,jmerkow/VTK,sumedhasingla/VTK,SimVascular/VTK,sumedhasingla/VTK,gram526/VTK,berendkleinhaneveld/VTK,gram526/VTK,SimVascular/VTK,hendradarwin/VTK,demarle/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,msmolens/VTK,sankhesh/VTK,sumedhasingla/VTK,sankhesh/VTK,sumedhasingla/VTK,mspark93/VTK,SimVascular/VTK,sumedhasingla/VTK,demarle/VTK,mspark93/VTK,keithroe/vtkoptix,biddisco/VTK,jmerkow/VTK,keithroe/vtkoptix,demarle/VTK,sankhesh/VTK,msmolens/VTK,hendradarwin/VTK,hendradarwin/VTK,berendkleinhaneveld/VTK,keithroe/vtkoptix,sankhesh/VTK,msmolens/VTK,ashray/VTK-EVM,ashray/VTK-EVM,biddisco/VTK,jmerkow/VTK,johnkit/vtk-dev,msmolens/VTK,jmerkow/VTK,candy7393/VTK,demarle/VTK,ashray/VTK-EVM,candy7393/VTK,berendkleinhaneveld/VTK,candy7393/VTK,candy7393/VTK,mspark93/VTK,johnkit/vtk-dev,ashray/VTK-EVM,hendradarwin/VTK,mspark93/VTK,jmerkow/VTK,msmolens/VTK,biddisco/VTK,berendkleinhaneveld/VTK,SimVascular/VTK,jmerkow/VTK,sankhesh/VTK,gram526/VTK,sumedhasingla/VTK,gram526/VTK,johnkit/vtk-dev,sankhesh/VTK,berendkleinhaneveld/VTK,ashray/VTK-EVM,SimVascular/VTK,demarle/VTK,msmolens/VTK,jmerkow/VTK,biddisco/VTK,biddisco/VTK,sankhesh/VTK,demarle/VTK,gram526/VTK,demarle/VTK,mspark93/VTK,msmolens/VTK,ashray/VTK-EVM,johnkit/vtk-dev,demarle/VTK,ashray/VTK-EVM,SimVascular/VTK,biddisco/VTK,mspark93/VTK,hendradarwin/VTK,mspark93/VTK,jmerkow/VTK,sumedhasingla/VTK,berendkleinhaneveld/VTK,candy7393/VTK,SimVascular/VTK,keithroe/vtkoptix,johnkit/vtk-dev,keithroe/vtkoptix,gram526/VTK,biddisco/VTK,SimVascular/VTK,mspark93/VTK,sumedhasingla/VTK,johnkit/vtk-dev,keithroe/vtkoptix,candy7393/VTK,hendradarwin/VTK,ashray/VTK-EVM,candy7393/VTK,keithroe/vtkoptix