Trac #11327

Fixes a bug where color conversion swapped blue and green values.
Fixes a bug where CONSTANT_COLOR/CONSTANT_ALPHA conflict guard
failed to check for ONE_MINUS variants.

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

git-svn-id: https://angleproject.googlecode.com/svn/trunk@27 736b8ea6-26fd-11df-bfd4-992fa37f6226