graphics_GLBench: refactor ignored tests.

Also add known images. Note that the known images for update
tests are contradictory and there is probably a bug in the
test.

BUG=chrome-os-partner:28183
TEST=Ran on Daisy.

Change-Id: I1cc5569e66c661040abc82179b8552986393af2d
Reviewed-on: https://chromium-review.googlesource.com/208203
Commit-Queue: Ilja Friedel <ihf@chromium.org>
Tested-by: Ilja Friedel <ihf@chromium.org>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
32 files changed
tree: a3f622d6f459d670f3d4ad84657579a2eeb5f704
  1. README
  2. glbench_knownbad_images/
  3. glbench_reference_images/