Launch icon within a Chrome extension

Launch icon within a Chrome extension

Is it possible to add a launch icon to an existing Chrome extension or
must I create a hosted app in order to have a link within the apps page on
the new tab page.
I tried adding to the current extension manifest the following
"app": {
"urls": [
"http://www.url.com/"
],
"launch": {
"web_url": "http://www.url.com/"
}
},
but it gave a warning that all of my extension related lines in the
manifest are not supported in hosted apps.
It doesn't make sense to create two different chrome apps just to have a
link on the apps tab. Is there a way to add a launch URL to an extension?