From: Bluezery <ohpowel@gmail.com>

From: Bluezery <ohpowel@gmail.com>
Subject: Re: [E-devel] [Patch][elm_map] Change grid management

(3) Simplify grid_load()
There exists 3 state for grid items. i.e., downloaded, downloading,
none states.
grid_load() does followings:
1. if a grid item does not exist, create it.
2. update a tile (if downloaded) or queues for download (if none) or
nothing  (if downloading)

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/elementary@66153 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33