plugin.js

(function() {
  var streams = {};

  function Stream() {
    this.enabled = true;
  };
  
  Stream.prototype.log = function() {
    if (this.enabled) {
      window.console.log.apply(window.console, Array.prototype.slice.call(arguments, 0));
    }
  };
  
  window.console.stream = function(name) {
    if (!streams[name]) {
      streams[name] = new Stream();
    }
    return streams[name];
  };
  
  window.console.on = function(name) {
    streams[name].enabled = true;
  };
  
  window.console.off = function(name) {
    streams[name].enabled = false;
  };
})();