Don't advertise 10, 10, 10, 2 RGBA format

TRAC #11610

The color_ramp conformance test renders each colour and reads it back to verify it, but it uses ReadPixels with UNSIGNED_BYTE with does not have enough precision.

Signed-off-by: Shannon Woods
Signed-off-by: Daniel Koch

Author:    Andrew Lewycky

git-svn-id: https://angleproject.googlecode.com/svn/trunk@170 736b8ea6-26fd-11df-bfd4-992fa37f6226
1 file changed