A little code snippet to check if the current browser is enabled to use the Chromium built-in PPAPI (a.k.a. "Pepper") Flash Player, i.e. instead of the Adobe Flash Player (or some other player, e.g. Gnash, Klash, etc.).

UsingPepperFlash.js

// NOTE: Some code taken from this StackOverflow question:
//   http://stackoverflow.com/questions/12866060/detecting-pepper-ppapi-flash-with-javascript

var isUsingPepperFlash = (function() {
    var getFlashPlayerFileName = function(mimeTypes, type) {
        return (
            mimeTypes &&
            mimeTypes[type] &&
            mimeTypes[type].enabledPlugin &&
            mimeTypes[type].enabledPlugin.filename
        ) || '';
    };

    return function() {
        var isPPAPI = false;
        
        var mimeTypes = window.navigator.mimeTypes;
        var flashMimeType = "application/x-shockwave-flash";
        var flashPlayerFileName = getFlashPlayerFileName(mimeTypes, flashMimeType).toLowerCase();
        if (flashPlayerFileName &&
            flashPlayerFileName === "pepflashplayer.dll" ||
            flashPlayerFileName === "libpepflashplayer.so" ||
            flashPlayerFileName === "pepperflashplayer.plugin")
        {
            isPPAPI = true;
        }
        return isPPAPI;
    };
})();

alert("Using Pepper Flash? " + isUsingPepperFlash());

I originally implemented this in a fiddle:

• Code: http://jsfiddle.net/JamesMGreene/QNtfB/
• Embedded Result: http://jsfiddle.net/JamesMGreene/QNtfB/embedded/result/
• Raw Result: http://fiddle.jshell.net/JamesMGreene/QNtfB/show/light/