Possible to suppress this in webgl2_conformance_expectations.py? These failures are known -- a recent spec change -- we need to update Chromium's implementation. I think there's another bug filed about them. Thanks.

Jie, this bug has been fixed in ToT Intel mesa driver, right? 

It seems to be irrelevant to intel mesa driver version. The error is not reproducible from chromium browser. I will try to reproduce from gpu_tests.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/284c15c86d9d9cd9e0e7cdbcb71c70edc74fbd4c

commit 284c15c86d9d9cd9e0e7cdbcb71c70edc74fbd4c
Author: vmpstr <vmpstr@chromium.org>
Date: Wed Aug 24 01:47:14 2016

gpu tests: Suppress failing ext-color-buffer-float test on linux intel.

BUG=640389
TBR=kbr@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2267343003
Cr-Commit-Position: refs/heads/master@{#413932}

[modify] https://crrev.com/284c15c86d9d9cd9e0e7cdbcb71c70edc74fbd4c/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

    Failed to run content/test/gpu/gpu_tests/gpu_integration_test.py. Likely I might have missed some setup steps to run gpu_tests. Is there any guide that I can refer to? Besides may I know the chrome://gpu info of this bot? So that I may be able to find a similar device to investigate. From my side, it's not reproducible on my gpu(Mesa DRI Intel(R) Iris Pro 6200 (Broadwell GT3e)) with both the default ubuntu driver(3.3 (Core Profile) Mesa 11.2.0) and ToT mesa driver(4.4 (Core Profile) Mesa 12.1.0-devel). 

If you build Chromium in Release mode then running:

./content/test/gpu/run_gpu_integration_test.py webgl_conformance --browser=release

will run the WebGL 1.0 tests.

./content/test/gpu/run_gpu_integration_test.py webgl_conformance --webgl-conformance-version=2.0.0 --browser=release

will run the WebGL 2.0 tests.

./content/test/gpu/run_gpu_integration_test.py webgl_conformance --webgl-conformance-version=2.0.0 --browser=release --test-filter=conformance2_extensions

lets you run a subset of the tests.

Some more documentation is at https://www.chromium.org/developers/testing/gpu-testing#TOC-Running-the-GPU-Tests-Locally but it might not all be relevant or up to date.

Thanks for helping. It has worked. But I failed to reproduce the "FAIL floating-point RGBA32F render target not supported" error". Without the ToT mesa driver, the error has been "FAIL the maximum value in SAMPLES should be at least 8" on my Ubuntu 16.04 BroadWell machine. Anyway let's wait for the TOT mesa driver.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/d894e4818670624d52b6ae3122e08eddad14dcbe

commit d894e4818670624d52b6ae3122e08eddad14dcbe
Author: jchen10 <jie.a.chen@intel.com>
Date: Thu Aug 23 06:44:37 2018

Whitelist ext-color-buffer-float conformance test

Remove the it from the expectation.

Bug: 640389
Change-Id: Id90ed5c40069fe36710782fe440b385a2b1e69e3
Reviewed-on: https://chromium-review.googlesource.com/1174102
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Jie A Chen <jie.a.chen@intel.com>
Cr-Commit-Position: refs/heads/master@{#585416}
[modify] https://crrev.com/d894e4818670624d52b6ae3122e08eddad14dcbe/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py