Chrome for both iPhone and iPad tie into your Google Account and not only syncs bookmarks across any device you may need them on, but can also track open browser tabs on any device you're signed into your Google account through Chrome with. This can be a huge time saver if you have a webpage open on your desktop or iPad and need it on your iPhone, or vice versa. No need to type URLs, just pull up the open tab.
That's all there is to it. You can always have access to whatever tabs you need in Chrome from a different device with these steps. Even if the device you need a tab from isn't online, it should still show you the most recently synced tabs before it went offline.