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Does this fail on all GPU types on Linux or just some?

@kbr, this test can pass at least on some Linux machine right now. I checked on several machines yesterday. And it can pass on bots too. 

please see the small patch which updates the cts expectation: https://chromium-review.googlesource.com/c/chromium/src/+/1010022

Thanks Yunchao. Unsuppressing in https://chromium-review.googlesource.com/1011295 .

Ah, thanks. Abandoned my change, LGTM'd and CQ'd yours.

Ah... Ken, feel free to land yours if you already have one patch. 

It's OK, Yunchao, yours was done earlier. I updated your commit message to be a little more clear though.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2b259759151914bc0d71bc6bb39f8676e8702980

commit 2b259759151914bc0d71bc6bb39f8676e8702980
Author: Yunchao He <yunchao.he@intel.com>
Date: Fri Apr 13 03:39:05 2018

Update WebGL 2 conformance test expectation.

Removes the suppression for:
  conformance2/textures/image_bitmap_from_image/
    tex-3d-r16f-red-float.html

Bug: 679695
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ifec56d01e4cf903f827a09a1aa176275912c8f0c
Reviewed-on: https://chromium-review.googlesource.com/1010022
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550493}
[modify] https://crrev.com/2b259759151914bc0d71bc6bb39f8676e8702980/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2b259759151914bc0d71bc6bb39f8676e8702980

commit 2b259759151914bc0d71bc6bb39f8676e8702980
Author: Yunchao He <yunchao.he@intel.com>
Date: Fri Apr 13 03:39:05 2018

Update WebGL 2 conformance test expectation.

Removes the suppression for:
  conformance2/textures/image_bitmap_from_image/
    tex-3d-r16f-red-float.html

Bug: 679695
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ifec56d01e4cf903f827a09a1aa176275912c8f0c
Reviewed-on: https://chromium-review.googlesource.com/1010022
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550493}
[modify] https://crrev.com/2b259759151914bc0d71bc6bb39f8676e8702980/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py