For the Intel specific failures, it seems they are all in the LINEAR filtering mode.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6ea77ea4e7e8379659ec2d6c90e97cdbd88c3a33

commit 6ea77ea4e7e8379659ec2d6c90e97cdbd88c3a33
Author: zmo <zmo@chromium.org>
Date: Fri Apr 22 23:29:37 2016

Roll WebGL 51b33d0..165311e

https://chromium.googlesource.com/external/khronosgroup/webgl.git/+log/51b33d0..165311e

BUG= 606021 , 606074 
TEST=bots
TBR=bajones@chromium.org,qiankun.miao@intel.com
NOTRY=true
CQ_INCLUDE_TRYBOTS=tryserver.chromium.win:win_optional_gpu_tests_rel;tryserver.chromium.mac:mac_optional_gpu_tests_rel;tryserver.chromium.linux:linux_optional_gpu_tests_rel

Review URL: https://codereview.chromium.org/1918463002

Cr-Commit-Position: refs/heads/master@{#389298}

[modify] https://crrev.com/6ea77ea4e7e8379659ec2d6c90e97cdbd88c3a33/DEPS
[modify] https://crrev.com/6ea77ea4e7e8379659ec2d6c90e97cdbd88c3a33/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/60714ca531b4b2f90ceed1a69ec44e0847998694

commit 60714ca531b4b2f90ceed1a69ec44e0847998694
Author: zmo <zmo@chromium.org>
Date: Wed Jun 22 18:09:28 2016

The disable_seamless_cube_map workaround should only apply to primary Intel.

On Mac retina where Intel is integrated and AMD/NVIDIA is discrete and is what
is used for WebGL, this workaround should not apply.

(This only affects WebGL2 on mac, so skip general try/cq bots)

BUG= 606074 , 597794 
TEST=mac gpu bots
R=bajones@chromium.org
NOTRY=true
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_optional_gpu_tests_rel;tryserver.chromium.mac:mac_optional_gpu_tests_rel;tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2081813002
Cr-Commit-Position: refs/heads/master@{#401344}

[modify] https://crrev.com/60714ca531b4b2f90ceed1a69ec44e0847998694/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
[modify] https://crrev.com/60714ca531b4b2f90ceed1a69ec44e0847998694/gpu/config/gpu_driver_bug_list_json.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d0cf15e974aff5aaf53df87079969f181948a099

commit d0cf15e974aff5aaf53df87079969f181948a099
Author: zmo <zmo@chromium.org>
Date: Thu Jun 30 21:27:12 2016

Enable seamless cubemap on Mac Intel.

BUG= 597794 , 606074 
NOTRY=true
TEST=eanbled webgl2 conformance tests
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_optional_gpu_tests_rel;tryserver.chromium.mac:mac_optional_gpu_tests_rel;tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2113573002
Cr-Commit-Position: refs/heads/master@{#403294}

[modify] https://crrev.com/d0cf15e974aff5aaf53df87079969f181948a099/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
[modify] https://crrev.com/d0cf15e974aff5aaf53df87079969f181948a099/gpu/config/gpu_driver_bug_list_json.cc