gpu_tests.webgl_conformance_integration_test.WebGLConformanceIntegrationTest.WebglConformance_conformance2_sync_sync_webgl_specific failing on Linux FYI Release (NVIDIA), looks like a flake.

https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Linux%20FYI%20Release%20%28NVIDIA%29/1103 and https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Linux%20FYI%20Release%20%28NVIDIA%29/1130

log:

[9/138] gpu_tests.webgl_conformance_integration_test.WebGLConformanceIntegrationTest.WebglConformance_conformance2_sync_sync_webgl_specific failed unexpectedly 8.8022s:
  
  Traceback (most recent call last):
    _RunGpuTest at content/test/gpu/gpu_tests/gpu_integration_test.py:132
      self.RunActualGpuTest(url, *args)
    RunActualGpuTest at content/test/gpu/gpu_tests/webgl_conformance_integration_test.py:204
      getattr(self, test_name)(test_path, *args[1:])
    _RunConformanceTest at content/test/gpu/gpu_tests/webgl_conformance_integration_test.py:218
      self._CheckTestCompletion()
    _CheckTestCompletion at content/test/gpu/gpu_tests/webgl_conformance_integration_test.py:214
      self.fail(self._WebGLTestMessages(self.tab))
    fail at .swarming_module/lib/python2.7/unittest/case.py:410
      raise self.failureException(msg)
  AssertionError: Sync object wasn't signaled in a reasonable timeframe (1577 ms)
  FAIL Sync object wasn't signaled in a reasonable timeframe (1577 ms)
  
  Locals:
    msg : u"Sync object wasn't signaled in a reasonable timeframe (1577 ms)\nFAIL Sync object wasn't signaled in a reasonable timeframe (1577 ms)\n"
  
  No path to crashpad_database_util found
  No minidump found via crashpad_database_util
  No minidump paths to symbolize
  No path to crashpad_database_util found
  No minidump found via crashpad_database_util
  Restarting browser due to unexpected test failure
  Closing browser (pid=4142) ...
  Failed to gracefully shutdown.
  Proceed to kill the browser.
  Browser is closed.
  Starting Chrome ['/b/s/w/ir/out/Release/chrome', '--use-gl=angle', '--disable-gpu-watchdog', '--enable-experimental-web-platform-features', '--use-angle=gl', '--disable-domain-blocking-for-3d-apis', '--test-type=gpu', '--disable-gpu-process-crash-limit', '--use-cmd-decoder=passthrough', '--js-flags=--expose-gc', '--enable-logging=stderr', '--autoplay-policy=no-user-gesture-required', '--enable-net-benchmarking', '--metrics-recording-only', '--no-default-browser-check', '--no-first-run', '--enable-gpu-benchmarking', '--deny-permission-prompts', '--autoplay-policy=no-user-gesture-required', '--disable-background-networking', '--disable-component-extensions-with-background-pages', '--disable-default-apps', '--disable-search-geolocation-disclosure', '--proxy-server=socks://localhost:58444', '--ignore-certificate-errors-spki-list=PhrPvGIaAMmd29hj8BCZOq096yj7uMpRNHpn5PDxI6I=', '--remote-debugging-port=0', '--enable-crash-reporter-for-testing', '--disable-component-update', '--window-size=1280,1024', '--user-data-dir=/b/s/w/itO9SMgw/tmpQ3hM5T', 'about:blank']
  DoNothingForwarder started between 127.0.0.1:44553 and 44553
  Got devtools config: ws://127.0.0.1:44553/devtools/browser/1a7bb22a-d49c-475d-b006-a54c6f8221c2
  Browser started (pid=4243).
  OS: linux trusty
  Browser command line: /b/s/w/ir/out/Release/chrome --use-gl=angle --disable-gpu-watchdog --enable-experimental-web-platform-features --use-angle=gl --disable-domain-blocking-for-3d-apis --test-type=gpu --disable-gpu-process-crash-limit --use-cmd-decoder=passthrough --js-flags=--expose-gc --enable-logging=stderr --autoplay-policy=no-user-gesture-required --enable-net-benchmarking --metrics-recording-only --no-default-browser-check --no-first-run --enable-gpu-benchmarking --deny-permission-prompts --autoplay-policy=no-user-gesture-required --disable-background-networking --disable-component-extensions-with-background-pages --disable-default-apps --disable-search-geolocation-disclosure --proxy-server=socks://localhost:58444 --ignore-certificate-errors-spki-list=PhrPvGIaAMmd29hj8BCZOq096yj7uMpRNHpn5PDxI6I= --remote-debugging-port=0 --enable-crash-reporter-for-testing --disable-component-update --window-size=1280,1024 --user-data-dir=/b/s/w/itO9SMgw/tmpQ3hM5T --flag-switches-begin --flag-switches-end about:blank
  GPU device 0: VENDOR = 0x10de (Nvidia), DEVICE = 0x1cb3
  GPU Attributes:
    amd_switchable      : False
    can_support_threaded_texture_mailbox: False
    direct_composition  : False
    direct_rendering    : True
    driver_date         : 
    driver_vendor       : Nvidia
    driver_version      : 384.90
    gl_extensions       : GL_ANGLE_client_arrays GL_ANGLE_depth_texture GL_ANGLE_framebuffer_blit GL_ANGLE_framebuffer_multisample GL_ANGLE_instanced_arrays GL_ANGLE_program_cache_control GL_ANGLE_request_extension GL_ANGLE_robust_client_memory GL_ANGLE_texture_compression_dxt3 GL_ANGLE_texture_compression_dxt5 GL_ANGLE_texture_rectangle GL_ANGLE_translated_shader_source GL_CHROMIUM_bind_generates_resource GL_CHROMIUM_bind_uniform_location GL_CHROMIUM_color_buffer_float_rgb GL_CHROMIUM_color_buffer_float_rgba GL_CHROMIUM_copy_texture GL_CHROMIUM_framebuffer_mixed_samples GL_CHROMIUM_path_rendering GL_CHROMIUM_sync_query GL_EXT_blend_minmax GL_EXT_color_buffer_half_float GL_EXT_debug_marker GL_EXT_discard_framebuffer GL_EXT_disjoint_timer_query GL_EXT_draw_buffers GL_EXT_frag_depth GL_EXT_map_buffer_range GL_EXT_multisample_compatibility GL_EXT_occlusion_query_boolean GL_EXT_read_format_bgra GL_EXT_robustness GL_EXT_sRGB GL_EXT_sRGB_write_control GL_EXT_shader_texture_lod GL_EXT_texture_compression_dxt1 GL_EXT_texture_filter_anisotropic GL_EXT_texture_format_BGRA8888 GL_EXT_texture_rg GL_EXT_texture_sRGB_decode GL_EXT_texture_storage GL_EXT_unpack_subimage GL_KHR_debug GL_NV_fence GL_NV_pack_subimage GL_OES_compressed_ETC1_RGB8_texture GL_OES_depth32 GL_OES_element_index_uint GL_OES_fbo_render_mipmap GL_OES_get_program_binary GL_OES_mapbuffer GL_OES_packed_depth_stencil GL_OES_rgb8_rgba8 GL_OES_standard_derivatives GL_OES_surfaceless_context GL_OES_texture_float GL_OES_texture_float_linear GL_OES_texture_half_float GL_OES_texture_half_float_linear GL_OES_texture_npot GL_OES_vertex_array_object 
    gl_renderer         : ANGLE (NVIDIA Corporation Quadro P400/PCIe/SSE2 OpenGL 4.5 core)
    gl_reset_notification_strategy: 33362
    gl_vendor           : Google Inc.
    gl_version          : OpenGL ES 2.0 (ANGLE 2.1.0.447bfac19acf)
    gl_ws_extensions    : EGL_EXT_create_context_robustness EGL_KHR_create_context EGL_KHR_get_all_proc_addresses EGL_ANGLE_create_context_webgl_compatibility EGL_CHROMIUM_create_context_bind_generates_resource EGL_EXT_pixel_format_float EGL_KHR_surfaceless_context EGL_ANGLE_display_texture_share_group EGL_ANGLE_create_context_client_arrays EGL_ANGLE_program_cache_control EGL_ANGLE_robust_resource_initialization EGL_ANGLE_create_context_extensions_enabled 
    gl_ws_vendor        : 
    gl_ws_version       : 1.4 (ANGLE 2.1.0.447bfac19acf)
    in_process_gpu      : False
    initialization_time : 0.06483
    jpeg_decode_accelerator_supported: False
    max_msaa_samples    : 8
    optimus             : False
    passthrough_cmd_decoder: True
    pixel_shader_version: 1.00
    process_crash_count : 0
    rgba_visual         : 0
    sandboxed           : True
    software_rendering  : False
    supports_overlays   : False
    system_visual       : 0
    vertex_shader_version: 1.00
    video_decode_accelerator_flags: 0
  Feature Status:
    2d_canvas           : enabled
    checker_imaging     : enabled_on
    flash_3d            : enabled
    flash_stage3d       : enabled
    flash_stage3d_baseline: enabled
    gpu_compositing     : enabled
    multiple_raster_threads: enabled_on
    native_gpu_memory_buffers: disabled_software
    rasterization       : disabled_software
    surface_synchronization: enabled_on
    video_decode        : unavailable_off
    viz_display_compositor: disabled_off
    webgl               : enabled
    webgl2              : enabled
  Driver Bug Workarounds:
    clear_uniforms_before_first_program_use
    disable_framebuffer_cmaa
    scalarize_vec_and_mat_constructor_args
  Traceback (most recent call last):
    File "/b/s/w/ir/third_party/catapult/telemetry/telemetry/testing/serially_executed_browser_test_case.py", line 206, in <lambda>
      return lambda self: based_method(self, *args)
    File "/b/s/w/ir/content/test/gpu/gpu_tests/gpu_integration_test.py", line 132, in _RunGpuTest
      self.RunActualGpuTest(url, *args)
    File "/b/s/w/ir/content/test/gpu/gpu_tests/webgl_conformance_integration_test.py", line 204, in RunActualGpuTest
      getattr(self, test_name)(test_path, *args[1:])
    File "/b/s/w/ir/content/test/gpu/gpu_tests/webgl_conformance_integration_test.py", line 218, in _RunConformanceTest
      self._CheckTestCompletion()
    File "/b/s/w/ir/content/test/gpu/gpu_tests/webgl_conformance_integration_test.py", line 214, in _CheckTestCompletion
      self.fail(self._WebGLTestMessages(self.tab))
  AssertionError: Sync object wasn't signaled in a reasonable timeframe (1577 ms)
  FAIL Sync object wasn't signaled in a reasonable timeframe (1577 ms)
  
[4243:4271:0403/232027.469380:WARNING:simple_synchronous_entry.cc(1255)] Could not open platform files for entry.
[4243:4243:0403/232027.469857:WARNING:gaia_auth_fetcher.cc(873)] Could not reach Google Accounts servers: errno -120
[4278:4278:0403/232028.067861:WARNING:angle_platform_impl.cc(59)] LogGLDebugMessage(155): 
	Source: OpenGL
	Type: Performance
	ID: 0x20092
	Severity: Medium
	Message: Program/shader state performance warning: Vertex shader in program 1 is being recompiled based on GL state.
WebglConformance_conformance2_textures_canvas_sub_rectangle_tex_2d_rgba4_rgba_unsigned_byte was expected to fail, but passed.

Assigning it to geofflang@ based on crbug.com/814905. geofflang@, could you please take a look?