On a PC, running chrome 25 (non beta) shows me a microphone icon, clicking on it prompts for input. When I stop talking, my alert call is executed. All good. On a Galaxy Note smart phone running chrome 25 (non beta) running Android 4.04, loading the same page does not show the microphone icon. Also doesn't work on a Google Nexus-10 tablet running android jelly bean.
I've also tried which also fails to show the microphone option on android chrome 25.
Given that the Chrome 25 release touts both Android speech capabilities and more compatibility between Android and desktop Chrome, I'm surprised this doesn't work. Anybody else tried this and gotten it to work?