code: function TimeToObjectInstanceMap(createObjectInstanceFunction, parent, id) {
      this.createObjectInstanceFunction_ = createObjectInstanceFunction;
      this.parent = parent;
      this.id = id;
      this.instances = [];
    }
docs: Tracks all the instances associated with a given ID over its lifetime.
  
  An id can be used multiple times throughout a trace, referring to different
  objects at different times. This data structure does the bookkeeping to
  figure out what ObjectInstance is referred to at a given timestamp.
  
  @constructor