code: function ValueType(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 ValueType.
  @memberof perftools.profiles
  @interface IValueType
  @property {number|Long} [type] ValueType type
  @property {number|Long} [unit] ValueType unit
   
  Constructs a new ValueType.
  @memberof perftools.profiles
  @classdesc Represents a ValueType.
  @constructor
  @param {perftools.profiles.IValueType=} [properties] Properties to set