Imran,
Yes you can run two ISP's on ASA 5525-x and even that was possible on ASA 5520.
http://www.cisco.com/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/118962-configure-asa-00.html
https://supportforums.cisco.com/document/139051/dual-isp-implementation-asa
http://www.cisco.com/c/en/us/support/docs/security/pix-500-series-security-appliances/70559-pix-dual-isp.html
The above links should help.
-
Pulkit
Please rate helpful posts.