docs: function(amount) {
        this.sliceGroup.shiftTimestampsForward(amount);
  
        if (this.timeSlices) {
          for (var i = 0; i < this.timeSlices.length; i++) {
            var slice = this.timeSlices[i];
            slice.start += amount;
          }
        }
  
        this.kernelSliceGroup.shiftTimestampsForward(amount);
        this.asyncSliceGroup.shiftTimestampsForward(amount);
      }