Caches MipLevel in TextureStorage11, to avoid repeated GetDesc calls.

TRAC #22341

Author: Shannon Woods
Signed-off-by: Nicolas Capens
Signed-off-by: Daniel Koch

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1693 736b8ea6-26fd-11df-bfd4-992fa37f6226
2 files changed