src/core/profiler.js
function (defer) {
    if (this.t0 !== null) {
      Profiler.new_value(this.name, this._elapsed(), 't', defer);
      this.t0 = null;
    }
  }
function (defer) {
    if (this.t0 !== null) {
      Profiler.new_value(this.name, this._elapsed(), 't', defer);
      this.t0 = null;
    }
  }
function ( defer ) { if ( this . t0 !== null ) { Profiler . new_value ( this . name , this . _elapsed ( ) , 't' , defer ) ; this . t0 = null ; } }
finish a time measurement and register it ``start`` should be called first, if not this function does not take effect
finish a time measurement and register it start should be called first if not this function does not take effect