code: function StringValue(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 StringValue.
  @memberof google.protobuf
  @interface IStringValue
  @property {string|null} [value] StringValue value
   
  Constructs a new StringValue.
  @memberof google.protobuf
  @classdesc Represents a StringValue.
  @implements IStringValue
  @constructor
  @param {google.protobuf.IStringValue=} [properties] Properties to set