Trac #19259
Issue=268
managed textures need to be set on the images so they can be updated
properly and to avoid the additional system memory copy of the surfaces.
Also make sure track the managed state properly.
Signed-off-by: Nicolas Capens
git-svn-id: https://angleproject.googlecode.com/svn/trunk@915 736b8ea6-26fd-11df-bfd4-992fa37f6226
