I have a web app calling a native app on android via an iframe intent which does not work in chrome 25 according to the following....
https://developers.google.com/c
For the scheme URL:
appname://RequestType/?Type=123&tn=0000000000
You would want to map to an intent URL of:
intent://RequestType/?Type=123&tn=0000000000#Intent;scheme=appname;package=com.example.appname;end