code: function addWelcomeProjectPath(path) {
          var welcomeProjects = ProjectModel._addWelcomeProjectPath(path,
                                                                   PreferencesManager.getViewState("welcomeProjects"));
          PreferencesManager.setViewState("welcomeProjects", welcomeProjects);
      }
docs: Adds the path to the list of welcome projects we've ever seen, if not on the list already.
  
  @param {string} path Path to possibly add