function storeFileSystem(fileSystem)
        {
            if (!fileSystem)
                return;
            this._fileSystems[fileSystemPath] = fileSystem;
            this.dispatchEventToListeners(WebInspector.IsolatedFileSystemManager.Events.FileSystemAdded, fileSystem);
        }
@param {?WebInspector.IsolatedFileSystem} fileSystem
@this {WebInspector.IsolatedFileSystemManager}