The latest version of Chrome Beta for Android has Chromecast support hidden behind a flag. If you flip on the flag chrome://flags/#enable-cast and restart the browser, you have an experimental Chromecast supported mobile browser ready.
Enable Experimental Cast flag has the following description “Enable experimental Chromecast support allowing to play and control videos from on Chromecast from Web”
You can access Youtube videos on Chrome for Android and send it to your Chromecast. All the HTML5 videos should work too. But since the feature itself is experimental, expect some bugs and performance issues on the way.
But still, this is an awesome feature worth trying out!
via Android Authority.