I'm afraid that Subversion can only be integrated with JIRA Server though a plugin connection, but in Cloud platform we suggest using Fisheye, and hosting is on a standalone/self hosted server: http://www.atlassian.com/software/fisheye/overview
We also recommend trying Git in combination with our OnDemand Git hosting service - Bitbucket: https://bitbucket.org/
I have also found this plugin below, but I did not tested its integration with JIRA Cloud, feel free to have a look:
I hope that help!
Cheers, Rodrigo Silva
Hey Community mates! Claire here from the Software Product Marketing team. We all know software development changes rapidly, and it's often tough to keep up. But from our research, we've found the h...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs