code: function Label(properties) {
                  if (properties)
                      for (var keys = Object.keys(properties), i = 0; i < keys.length; ++i)
                          if (properties[keys[i]] != null)
                              this[keys[i]] = properties[keys[i]];
              }
docs: Properties of a Label.
  @memberof perftools.profiles
  @interface ILabel
  @property {number|Long} [key] Label key
  @property {number|Long} [str] Label str
  @property {number|Long} [num] Label num
  @property {number|Long} [numUnit] Label numUnit
   
  Constructs a new Label.
  @memberof perftools.profiles
  @classdesc Represents a Label.
  @constructor
  @param {perftools.profiles.ILabel=} [properties] Properties to set