A simple implementation to augment JavaScript objects with events

For example, to create an alarm event for SmokeDetector

function SmokeDetector() {
    this.defineEvents(['alarm']);
 };
base.augment(SmokeDetector, base.Events);

To fire an event
SmokeDetector.prototype.onCarbonMonoxideDetected = function () {
  var param = {} // optional parameters
  this.raiseEvent('alarm', param);
}

To listen to an event
var smokeDetector = new SmokeDetector();
smokeDetector.addEventListener('alarm',listenerObj.someCallback,listenerObj);

The code lives in (base.js), a module that contains JavaScript utility components and methods for the web app.

Review URL: https://codereview.chromium.org/245923002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@266164 0039d316-1c4b-4281-b951-d872f2087c98

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