Add a helper method to gl::Framebuffer to check if we are drawing to color attachment 0 only.

TRAC #22898

Signed-off-by: Geoff Lang
Signed-off-by: Shannon Woods
Author: Jamie Madill

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@2217 736b8ea6-26fd-11df-bfd4-992fa37f6226
2 files changed