[PATCH] Do not add checkboxes to Import from Backlot videos that are already imported

I'm actually looking at this again with 7.x-2.x, and I think there's an even better way to do it: Custom Metadata via the Backlot API.
http://support.ooyala.com/developers/documentation/api/asset_metadata.html

This would allow us to write metadata back to Ooyala backlot for each asset that's imported, and in this case I think an "imported_at" timestamp would be great. You can then use the "include" parameter during your GET requests to filter out a) any videos previously imported, or b) videos that were imported at certain times, or onto certain sites. (For instance, maybe there could be additional metadata with site IDs or domains, so if you run multiple sites, you could have the site listed in this metadata as well. Up to 100, as per API standards.)

It would of course require some cron implementation for videos that have already been imported into Drupal, but I think it might be something worth researching, especially as we approach the 500-video limit for the API. The filtering needs to happen at the Backlot side, not on the Drupal side within an array_diff().

Also it looks like in 7.x, $form_state['post'] no longer exists, so the patch in #1 does not work. Changing it to $form_state['input'] works, e.g.:

if (isset($form_state['input']['status_filter'])) {
      if ($form_state['input']['status_filter'] == 'imported') {
        $videos = array_intersect_key($videos, $statuses);
      }
      elseif ($form_state['input']['status_filter'] == 'unimported') {
        $videos = array_diff_key($videos, $statuses);
      }
    }
...

Here's an updated patch for the latest version of 7.x-2.x-dev. It allows the list to be filtered by Imported and Unimported.

This issue is also related to a new (meta?) issue I opened: #1891914: Paginate, filter, and sort the import list