function FlateWorker(action, options) {
    GenericWorker.call(this, "FlateWorker/" + action);

    this._pako = null;
    this._pakoAction = action;
    this._pakoOptions = options;
    // the `meta` object from the last chunk received
    // this allow this worker to pass around metadata
    this.meta = {};
}
Create a worker that uses pako to inflate/deflate.
@constructor
@param {String} action the name of the pako function to call : either "Deflate" or "Inflate".
@param {Object} options the options to use when (de)compressing.