Adds a state machine behaviour class of type stateMachineBehaviourType to the AnimatorState for layer layerIndex. This function should be used when you are dealing with synchronized layer and would like to add a state machine behaviour on a synchronized layer. C# Users can use a generic version.
Note that there is no RemoveEffectiveStateMachineBehaviour(), to remove a state machine behaviour, use Object.Destroy.
Generic version. See the Generic Functions page for more details.