The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ede7651e04b8dd5a8d987fc0e916dd3056e2ca53

commit ede7651e04b8dd5a8d987fc0e916dd3056e2ca53
Author: Xida Chen <xidachen@chromium.org>
Date: Tue Apr 24 15:16:23 2018

Disable MusDemoTest.CheckMusDemoDraws on linux

TBR=thestig@chromium.org
NOTRY=true

Bug: 836248
Change-Id: I3664a670dd4b794b4a5a595988542336a8d9957b
Reviewed-on: https://chromium-review.googlesource.com/1025643
Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553122}
[modify] https://crrev.com/ede7651e04b8dd5a8d987fc0e916dd3056e2ca53/services/ui/demo/mus_demo_unittests.cc

Maksim: can you take a look at this? I think it's linux-ozone

https://logs.chromium.org/v/?s=chromium%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8948357322596711168%2F%2B%2Fsteps%2Fservices_unittests%2F0%2Flogs%2FMusDemoTest.CheckMusDemoDraws%2F0

[ RUN      ] MusDemoTest.CheckMusDemoDraws
[26022:26725:0424/071219.427698:29463315189:INFO:service_process_launcher.cc(195)] Launched child process pid=26738, instance=, name=mus_demo, user_id=505C0EE9-3013-43C0-82B0-A84F50CF8D84
[26022:26725:0424/071219.432311:29463319789:INFO:service_process_launcher.cc(195)] Launched child process pid=26740, instance=, name=ui, user_id=adcf53bc-d560-4436-ac91-e14dc985c3d1
[26022:26725:0424/071219.704088:29463591565:INFO:service_process_launcher.cc(195)] Launched child process pid=26831, instance=, name=test_ime_driver, user_id=adcf53bc-d560-4436-ac91-e14dc985c3d1
[26740:26824:0424/071219.711474:29463598930:ERROR:gl_implementation.cc(292)] Failed to load libGL.so.1: libGL.so.1: cannot open shared object file: No such file or directory
[26738:26738:0424/071220.682050:29464569508:ERROR:screen_base.cc(40)] Not implemented reached in virtual display::Display display::ScreenBase::GetDisplayNearestWindow(gfx::NativeWindow) const
[26740:26824:0424/071219.737971:29463625428:FATAL:gl_factory_x11.cc(93)] Check failed: false.
#0 0x0000f7401727 base::debug::StackTrace::StackTrace()
#1 0x0000f70df59c base::debug::StackTrace::StackTrace()
#2 0x0000f715cc30 logging::LogMessage::~LogMessage()
#3 0x0000f1e25eac gl::init::CreateViewGLSurface()
#4 0x0000f2fd4f95 gpu::ImageTransportSurface::CreateNativeSurface()
#5 0x0000f3097242 gpu::InProcessCommandBuffer::InitializeOnGpuThread()
...

Something is strange here. From the output error Lei pasted

(...)
[26740:26824:0424/071219.737971:29463625428:FATAL:gl_factory_x11.cc(93)] Check failed: false.
#0 0x0000f7401727 base::debug::StackTrace::StackTrace()
(...)

... ui/gl/init/gl_factory_x11.cc should not be used on Ozone/Linux builds 
at  all. Instead, ui/gl/init/gl_factory_ozone.cc should.

I just confirmed it locally.