dEQP-GLES3.functional.fbo.color.tex3d.rgb10_a2ui was already failing but
because the framebuffer was marked as unsupported, dEQP considers the test to
be passing.

BUG=angleproject:1149
BUG=angleproject:1097

Change-Id: I82223e8e927d1fd6d66f75b5fdea7989c92d706d
Reviewed-on: https://chromium-review.googlesource.com/298031Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>