Make sure the driver knows the texture is dirty when only lower level mipmaps are updated.

TRAC #21588
Issue=353
Signed-off-by: Shannon Woods
Signed-off-by: Daniel Koch
Author: Nicolas Capens

git-svn-id: https://angleproject.googlecode.com/svn/trunk@1287 736b8ea6-26fd-11df-bfd4-992fa37f6226
1 file changed