Getting a list of mecanim states in Animator 4.3+

MecanimStatesList

UnityEditorInternal.AnimatorController ac = GetComponent<Animator>().runtimeAnimatorController as UnityEditorInternal.AnimatorController;
UnityEditorInternal.StateMachine sm = ac.GetLayer(0).stateMachine;
for (int i = 0; i < sm.stateCount; i++)
{
    UnityEditorInternal.State state = sm.GetState(i);
    Debug.Log(string.Format("State: {0}", state.uniqueName));
}