WebglConformance_conformance2_rendering_blitframebuffer_test is failing sometimes on Linux Nvidia FYI Release.

First failure not obscured by other issues: https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Linux%20FYI%20Release%20%28NVIDIA%29/6391

Dump:

[8/139] gpu_tests.webgl_conformance_integration_test.WebGLConformanceIntegrationTest.WebglConformance_conformance2_rendering_blitframebuffer_test failed unexpectedly 6.1300s:
  
  Traceback (most recent call last):
    _RunGpuTest at content/test/gpu/gpu_tests/gpu_integration_test.py:155
      self.RunActualGpuTest(url, *args)
    RunActualGpuTest at content/test/gpu/gpu_tests/webgl_conformance_integration_test.py:190
      getattr(self, test_name)(test_path, *args[1:])
    _RunConformanceTest at content/test/gpu/gpu_tests/webgl_conformance_integration_test.py:210
      self._CheckTestCompletion()
    _CheckTestCompletion at content/test/gpu/gpu_tests/webgl_conformance_integration_test.py:206
      self.fail(self._WebGLTestMessages(self.tab))
    fail at .swarming_module/lib/python2.7/unittest/case.py:410
      raise self.failureException(msg)
  AssertionError: Unable to fetch WebGL rendering context for Canvas
  FAIL Unable to fetch WebGL rendering context for Canvas
  WebGL context does not exist
  FAIL WebGL context does not exist
  
  Locals:
    msg : u'Unable to fetch WebGL rendering context for Canvas\nFAIL Unable to fetch WebGL rendering context for Canvas\nWebGL context does not exist\nFAIL WebGL context does not exist\n'
  
  No path to crashpad_database_util found
  No minidump found via crashpad_database_util
  Restarting browser due to unexpected test failure
  Closing browser (pid=6390) ...
  Failed to gracefully shutdown.
  Proceed to kill the browser.
  Browser is closed.
  Chrome Env: {'MANDATORY_PATH': '/usr/share/gconf/gnome-fallback.mandatory.path', 'XDG_GREETER_DATA_DIR': '/var/lib/lightdm-data/chrome-bot', 'GNOME_DESKTOP_SESSION_ID': 'this-is-deprecated', 'CHROME_HEADLESS': '1', 'XDG_CURRENT_DESKTOP': 'Unity', 'XDG_VTNR': '7', 'GTEST_TOTAL_SHARDS': '20', 'QT_IM_MODULE': 'ibus', 'LOGNAME': 'chrome-bot', 'USER': 'chrome-bot', 'GNOME_KEYRING_CONTROL': '/run/user/1000/keyring-qGFQ5h', 'BOTO_CONFIG': '/home/chrome-bot/.boto', 'PATH': '/b/swarm_slave/w/ir/.swarming_module_cache/vpython/34c62b/bin:/b/swarm_slave/w/ir/.swarming_module:/b/swarm_slave/w/ir/.swarming_module/bin:/b/swarm_slave/cipd_cache/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/opt/dell/srvadmin/bin:/b/swarm_slave/w/ir/.swarming_module_cache/vpython/34c62b/lib/python2.7/site-packages/cv2', 'SWARMING_BOT_ID': 'build79-m4', 'DISPLAY': ':0', 'LANG': 'en_US.UTF-8', 'VIRTUAL_ENV': '/b/swarm_slave/w/ir/.swarming_module_cache/vpython/34c62b', 'SHELL': '/bin/bash', 'XDG_SESSION_PATH': '/org/freedesktop/DisplayManager/Session0', 'XAUTHORITY': '/home/chrome-bot/.Xauthority', 'LANGUAGE': 'en_US:', 'SESSION_MANAGER': 'local/build79-m4:@/tmp/.ICE-unix/2622,unix/build79-m4:/tmp/.ICE-unix/2622', 'SHLVL': '0', 'CHROME_DEVEL_SANDBOX': '/opt/chromium/chrome_sandbox', 'QT_QPA_PLATFORMTHEME': 'appmenu-qt5', 'CLUTTER_IM_MODULE': 'xim', 'SWARMING_HEADLESS': '1', 'QT4_IM_MODULE': 'xim', 'JOB': 'dbus', 'SESSION': 'gnome-fallback', 'DESKTOP_AUTOSTART_ID': '10ca95d9a2533b8c1915424447104684500000026220005', 'PYTHONNOUSERSITE': '1', 'IM_CONFIG_PHASE': '1', 'LUCI_CONTEXT': '/b/swarm_slave/w/it_8HhwJ/luci_ctx.L95q1y.json', 'GPG_AGENT_INFO': '/run/user/1000/keyring-qGFQ5h/gpg:0:1', 'HOME': '/home/chrome-bot', 'CIPD_CACHE_DIR': '/b/swarm_slave/cipd_cache/cache', 'SELINUX_INIT': 'YES', 'GIO_LAUNCHED_DESKTOP_FILE': '/home/chrome-bot/.config/autostart/swarming.desktop', 'XDG_RUNTIME_DIR': '/run/user/1000', 'GTK_IM_MODULE': 'ibus', 'PYTHONPATH': '/b/swarm_slave/w/ir/third_party/catapult/telemetry', 'SESSIONTYPE': 'gnome-session', 'GTEST_SHARD_INDEX': '5', 'VPYTHON_VIRTUALENV_ROOT': '/b/swarm_slave/w/ir/.swarming_module_cache/vpython', 'GDMSESSION': 'gnome-fallback', 'XMODIFIERS': '@im=ibus', 'DEFAULTS_PATH': '/usr/share/gconf/gnome-fallback.default.path', 'TEXTDOMAINDIR': '/usr/share/locale/', 'NO_GCE_CHECK': 'False', 'GIO_LAUNCHED_DESKTOP_FILE_PID': '2944', 'XDG_SEAT_PATH': '/org/freedesktop/DisplayManager/Seat0', 'LC_ALL': 'en_US.UTF-8', 'XDG_SESSION_ID': 'c1', 'DBUS_SESSION_BUS_ADDRESS': 'unix:abstract=/tmp/dbus-v203I4oG9D', 'TMPDIR': '/b/swarm_slave/w/it_8HhwJ', 'SWARMING_SERVER': 'https://chromium-swarm.appspot.com', 'SWARMING_TASK_ID': '4139dcfb1abe5311', 'DESKTOP_SESSION': 'gnome-fallback', 'SSH_AUTH_SOCK': '/run/user/1000/keyring-qGFQ5h/ssh', 'XDG_CONFIG_DIRS': '/etc/xdg/xdg-gnome-fallback:/usr/share/upstart/xdg:/etc/xdg', 'GNOME_KEYRING_PID': '2578', 'CIPD_PROTOCOL': 'v2', 'GDM_LANG': 'en_US', 'GTK_MODULES': 'overlay-scrollbar:unity-gtk-module', 'UPSTART_SESSION': 'unix:abstract=/com/ubuntu/upstart-session/1000/2466', 'INSTANCE': '', 'PWD': '/home/chrome-bot', 'TEXTDOMAIN': 'im-config', 'XDG_MENU_PREFIX': 'gnome-', 'LC_MESSAGES': 'en_US.UTF-8', 'XDG_DATA_DIRS': '/usr/share/gnome-fallback:/usr/share/gnome:/usr/local/share/:/usr/share/', 'BREAKPAD_DUMP_LOCATION': '/b/swarm_slave/w/it_8HhwJ/tmpA2nyIq', 'XDG_SEAT': 'seat0'}
  Starting Chrome ['/b/swarm_slave/w/ir/out/Release/chrome', '--disable-gpu-watchdog', '--enable-experimental-web-platform-features', '--test-type=gpu', '--disable-gpu-process-for-dx12-vulkan-info-collection', '--disable-domain-blocking-for-3d-apis', '--disable-gpu-process-crash-limit', '--disable-blink-features=WebXR', '--js-flags=--expose-gc', '--enable-logging=stderr', '--autoplay-policy=no-user-gesture-required', '--disable-features=UseSurfaceLayerForVideo', '--enable-net-benchmarking', '--metrics-recording-only', '--no-default-browser-check', '--no-first-run', '--ignore-background-tasks', '--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:54409', '--proxy-bypass-list=<-loopback>', '--remote-debugging-port=0', '--enable-crash-reporter-for-testing', '--disable-component-update', '--window-size=1280,1024', '--user-data-dir=/b/swarm_slave/w/it_8HhwJ/tmpPkB0Fi', 'about:blank']
  DoNothingForwarder started between 127.0.0.1:41951 and 41951
  Browser started (pid=6527).
  OS: linux ubuntu
  Browser command line: /b/swarm_slave/w/ir/out/Release/chrome --disable-gpu-watchdog --enable-experimental-web-platform-features --test-type=gpu --disable-gpu-process-for-dx12-vulkan-info-collection --disable-domain-blocking-for-3d-apis --disable-gpu-process-crash-limit --disable-blink-features=WebXR --js-flags=--expose-gc --enable-logging=stderr --autoplay-policy=no-user-gesture-required --disable-features=UseSurfaceLayerForVideo --enable-net-benchmarking --metrics-recording-only --no-default-browser-check --no-first-run --ignore-background-tasks --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:54409 --proxy-bypass-list=<-loopback> --remote-debugging-port=0 --enable-crash-reporter-for-testing --disable-component-update --window-size=1280,1024 --user-data-dir=/b/swarm_slave/w/it_8HhwJ/tmpPkB0Fi --flag-switches-begin --flag-switches-end --file-url-path-alias=/gen=/b/swarm_slave/w/ir/out/Release/gen about:blank
  GPU device 0: VENDOR = 0x10de (NVIDIA Corporation), DEVICE = 0x1cb3 (Quadro P400/PCIe/SSE2)
  GPU Attributes:
    amd_switchable      : False
    can_support_threaded_texture_mailbox: False
    direct_rendering    : True
    gl_extensions       : GL_AMD_multi_draw_indirect GL_AMD_seamless_cubemap_per_texture GL_AMD_vertex_shader_viewport_index GL_AMD_vertex_shader_layer GL_ARB_arrays_of_arrays GL_ARB_base_instance GL_ARB_bindless_texture GL_ARB_blend_func_extended GL_ARB_buffer_storage GL_ARB_cl_event GL_ARB_clear_buffer_object GL_ARB_clear_texture GL_ARB_clip_control GL_ARB_color_buffer_float GL_ARB_compressed_texture_pixel_storage GL_ARB_conservative_depth GL_ARB_compute_shader GL_ARB_compute_variable_group_size GL_ARB_conditional_render_inverted GL_ARB_copy_buffer GL_ARB_copy_image GL_ARB_cull_distance GL_ARB_debug_output GL_ARB_depth_buffer_float GL_ARB_depth_clamp GL_ARB_depth_texture GL_ARB_derivative_control GL_ARB_direct_state_access GL_ARB_draw_buffers GL_ARB_draw_buffers_blend GL_ARB_draw_indirect GL_ARB_draw_elements_base_vertex GL_ARB_draw_instanced GL_ARB_enhanced_layouts GL_ARB_ES2_compatibility GL_ARB_ES3_compatibility GL_ARB_ES3_1_compatibility GL_ARB_ES3_2_compatibility GL_ARB_explicit_attrib_location GL_ARB_explicit_uniform_location GL_ARB_fragment_coord_conventions GL_ARB_fragment_layer_viewport GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_fragment_shader GL_ARB_fragment_shader_interlock GL_ARB_framebuffer_no_attachments GL_ARB_framebuffer_object GL_ARB_framebuffer_sRGB GL_ARB_geometry_shader4 GL_ARB_get_program_binary GL_ARB_get_texture_sub_image GL_ARB_gl_spirv GL_ARB_gpu_shader5 GL_ARB_gpu_shader_fp64 GL_ARB_gpu_shader_int64 GL_ARB_half_float_pixel GL_ARB_half_float_vertex GL_ARB_imaging GL_ARB_indirect_parameters GL_ARB_instanced_arrays GL_ARB_internalformat_query GL_ARB_internalformat_query2 GL_ARB_invalidate_subdata GL_ARB_map_buffer_alignment GL_ARB_map_buffer_range GL_ARB_multi_bind GL_ARB_multi_draw_indirect GL_ARB_multisample GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_occlusion_query2 GL_ARB_parallel_shader_compile GL_ARB_pipeline_statistics_query GL_ARB_pixel_buffer_object GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_post_depth_coverage GL_ARB_program_interface_query GL_ARB_provoking_vertex GL_ARB_query_buffer_object GL_ARB_robust_buffer_access_behavior GL_ARB_robustness GL_ARB_sample_locations GL_ARB_sample_shading GL_ARB_sampler_objects GL_ARB_seamless_cube_map GL_ARB_seamless_cubemap_per_texture GL_ARB_separate_shader_objects GL_ARB_shader_atomic_counter_ops GL_ARB_shader_atomic_counters GL_ARB_shader_ballot GL_ARB_shader_bit_encoding GL_ARB_shader_clock GL_ARB_shader_draw_parameters GL_ARB_shader_group_vote GL_ARB_shader_image_load_store GL_ARB_shader_image_size GL_ARB_shader_objects GL_ARB_shader_precision GL_ARB_shader_storage_buffer_object GL_ARB_shader_subroutine GL_ARB_shader_texture_image_samples GL_ARB_shader_texture_lod GL_ARB_shading_language_100 GL_ARB_shader_viewport_layer_array GL_ARB_shading_language_420pack GL_ARB_shading_language_include GL_ARB_shading_language_packing GL_ARB_shadow GL_ARB_sparse_buffer GL_ARB_sparse_texture GL_ARB_sparse_texture2 GL_ARB_sparse_texture_clamp GL_ARB_stencil_texturing GL_ARB_sync GL_ARB_tessellation_shader GL_ARB_texture_barrier GL_ARB_texture_border_clamp GL_ARB_texture_buffer_object GL_ARB_texture_buffer_object_rgb32 GL_ARB_texture_buffer_range GL_ARB_texture_compression GL_ARB_texture_compression_bptc GL_ARB_texture_compression_rgtc GL_ARB_texture_cube_map GL_ARB_texture_cube_map_array GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3 GL_ARB_texture_filter_minmax GL_ARB_texture_float GL_ARB_texture_gather GL_ARB_texture_mirror_clamp_to_edge GL_ARB_texture_mirrored_repeat GL_ARB_texture_multisample GL_ARB_texture_non_power_of_two GL_ARB_texture_query_levels GL_ARB_texture_query_lod GL_ARB_texture_rectangle GL_ARB_texture_rg GL_ARB_texture_rgb10_a2ui GL_ARB_texture_stencil8 GL_ARB_texture_storage GL_ARB_texture_storage_multisample GL_ARB_texture_swizzle GL_ARB_texture_view GL_ARB_timer_query GL_ARB_transform_feedback2 GL_ARB_transform_feedback3 GL_ARB_transform_feedback_instanced GL_ARB_transform_feedback_overflow_query GL_ARB_transpose_matrix GL_ARB_uniform_buffer_object GL_ARB_vertex_array_bgra GL_ARB_vertex_array_object GL_ARB_vertex_attrib_64bit GL_ARB_vertex_attrib_binding GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader GL_ARB_vertex_type_10f_11f_11f_rev GL_ARB_vertex_type_2_10_10_10_rev GL_ARB_viewport_array GL_ARB_window_pos GL_ATI_draw_buffers GL_ATI_texture_float GL_ATI_texture_mirror_once GL_S3_s3tc GL_EXT_texture_env_add GL_EXT_abgr GL_EXT_bgra GL_EXT_bindable_uniform GL_EXT_blend_color GL_EXT_blend_equation_separate GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_compiled_vertex_array GL_EXT_Cg_shader GL_EXT_depth_bounds_test GL_EXT_direct_state_access GL_EXT_draw_buffers2 GL_EXT_draw_instanced GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_framebuffer_blit GL_EXT_framebuffer_multisample GL_EXTX_framebuffer_mixed_formats GL_EXT_framebuffer_multisample_blit_scaled GL_EXT_framebuffer_object GL_EXT_framebuffer_sRGB GL_EXT_geometry_shader4 GL_EXT_gpu_program_parameters GL_EXT_gpu_shader4 GL_EXT_multi_draw_arrays GL_EXT_packed_depth_stencil GL_EXT_packed_float GL_EXT_packed_pixels GL_EXT_pixel_buffer_object GL_EXT_point_parameters GL_EXT_polygon_offset_clamp GL_EXT_post_depth_coverage GL_EXT_provoking_vertex GL_EXT_raster_multisample GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_shader_objects GL_EXT_separate_specular_color GL_EXT_shader_image_load_formatted GL_EXT_shader_image_load_store GL_EXT_shader_integer_mix GL_EXT_shadow_funcs GL_EXT_sparse_texture2 GL_EXT_stencil_two_side GL_EXT_stencil_wrap GL_EXT_texture3D GL_EXT_texture_array GL_EXT_texture_buffer_object GL_EXT_texture_compression_dxt1 GL_EXT_texture_compression_latc GL_EXT_texture_compression_rgtc GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map GL_EXT_texture_edge_clamp GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 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GL_NV_gpu_program_fp64 GL_NV_gpu_shader5 GL_NV_half_float GL_NV_light_max_exponent GL_NV_multisample_coverage GL_NV_multisample_filter_hint GL_NV_occlusion_query GL_NV_packed_depth_stencil GL_NV_parameter_buffer_object GL_NV_parameter_buffer_object2 GL_NV_path_rendering GL_NV_path_rendering_shared_edge GL_NV_pixel_data_range GL_NV_point_sprite GL_NV_primitive_restart GL_NV_register_combiners GL_NV_register_combiners2 GL_NV_sample_locations GL_NV_sample_mask_override_coverage GL_NV_shader_atomic_counters GL_NV_shader_atomic_float GL_NV_shader_atomic_float64 GL_NV_shader_atomic_fp16_vector GL_NV_shader_atomic_int64 GL_NV_shader_buffer_load GL_NV_shader_storage_buffer_object GL_NV_stereo_view_rendering GL_NV_texgen_reflection GL_NV_texture_barrier GL_NV_texture_compression_vtc GL_NV_texture_env_combine4 GL_NV_texture_multisample GL_NV_texture_rectangle GL_NV_texture_shader GL_NV_texture_shader2 GL_NV_texture_shader3 GL_NV_transform_feedback GL_NV_transform_feedback2 GL_NV_uniform_buffer_unified_memory GL_NV_vdpau_interop GL_NV_vertex_array_range GL_NV_vertex_array_range2 GL_NV_vertex_attrib_integer_64bit GL_NV_vertex_buffer_unified_memory GL_NV_vertex_program GL_NV_vertex_program1_1 GL_NV_vertex_program2 GL_NV_vertex_program2_option GL_NV_vertex_program3 GL_NV_viewport_array2 GL_NV_viewport_swizzle GL_NVX_conditional_render GL_NVX_gpu_memory_info GL_NVX_nvenc_interop GL_NV_shader_thread_group GL_NV_shader_thread_shuffle GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent GL_SGIS_generate_mipmap GL_SGIS_texture_lod GL_SGIX_depth_texture GL_SGIX_shadow GL_SUN_slice_accum
    gl_renderer         : Quadro P400/PCIe/SSE2
    gl_reset_notification_strategy: 33362
    gl_vendor           : NVIDIA Corporation
    gl_version          : 4.5.0 NVIDIA 384.90
    gl_ws_extensions    : GLX_EXT_visual_info GLX_EXT_visual_rating GLX_EXT_import_context GLX_SGIX_fbconfig GLX_SGIX_pbuffer GLX_SGI_video_sync GLX_SGI_swap_control GLX_EXT_swap_control GLX_EXT_swap_control_tear GLX_EXT_texture_from_pixmap GLX_EXT_buffer_age GLX_ARB_create_context GLX_ARB_create_context_profile GLX_EXT_create_context_es_profile GLX_EXT_create_context_es2_profile GLX_ARB_create_context_robustness GLX_NV_delay_before_swap GLX_EXT_stereo_tree GLX_EXT_libglvnd GLX_ARB_context_flush_control GLX_NV_robustness_video_memory_purge GLX_ARB_multisample GLX_NV_float_buffer GLX_ARB_fbconfig_float GLX_NV_swap_group GLX_EXT_framebuffer_sRGB GLX_NV_copy_image GLX_NV_copy_buffer GLX_NV_video_capture 
    gl_ws_vendor        : NVIDIA Corporation
    gl_ws_version       : 1.4
    in_process_gpu      : False
    initialization_time : 0.071913
    jpeg_decode_accelerator_supported: False
    max_msaa_samples    : 64
    oop_rasterization_supported: True
    optimus             : False
    passthrough_cmd_decoder: False
    pixel_shader_version: 4.50
    process_crash_count : 0
    rgba_visual         : 162
    sandboxed           : True
    software_rendering  : False
    system_visual       : 33
    vertex_shader_version: 4.50
    video_decode_accelerator_flags: 0
  Feature Status:
    2d_canvas           : enabled
    flash_3d            : enabled
    flash_stage3d       : enabled
    flash_stage3d_baseline: enabled
    gpu_compositing     : enabled
    multiple_raster_threads: enabled_on
    native_gpu_memory_buffers: disabled_software
    oop_rasterization   : disabled_off
    protected_video_decode: unavailable_off
    rasterization       : disabled_software
    skia_deferred_display_list: disabled_off
    skia_renderer       : disabled_off
    surface_control     : disabled_off
    surface_synchronization: enabled_on
    video_decode        : unavailable_off
    viz_display_compositor: enabled_on
    webgl               : enabled
    webgl2              : enabled
  Driver Bug Workarounds:
    clear_uniforms_before_first_program_use
    disable_discard_framebuffer
    disable_framebuffer_cmaa
    force_cube_complete
    init_gl_position_in_vertex_shader
    init_vertex_attributes
    pack_parameters_workaround_with_pack_buffer
    reset_base_mipmap_level_before_texstorage
    scalarize_vec_and_mat_constructor_args
    unpack_alignment_workaround_with_unpack_buffer
    unpack_overlapping_rows_separately_unpack_buffer
    use_virtualized_gl_contexts
    disabled_extension__gl__khr_blend_equation_advanced
    disabled_extension__gl__khr_blend_equation_advanced_coherent
  Traceback (most recent call last):
    File "/b/swarm_slave/w/ir/third_party/catapult/telemetry/telemetry/testing/serially_executed_browser_test_case.py", line 214, in <lambda>
      return lambda self: based_method(self, *args)
    File "/b/swarm_slave/w/ir/content/test/gpu/gpu_tests/gpu_integration_test.py", line 155, in _RunGpuTest
      self.RunActualGpuTest(url, *args)
    File "/b/swarm_slave/w/ir/content/test/gpu/gpu_tests/webgl_conformance_integration_test.py", line 190, in RunActualGpuTest
      getattr(self, test_name)(test_path, *args[1:])
    File "/b/swarm_slave/w/ir/content/test/gpu/gpu_tests/webgl_conformance_integration_test.py", line 210, in _RunConformanceTest
      self._CheckTestCompletion()
    File "/b/swarm_slave/w/ir/content/test/gpu/gpu_tests/webgl_conformance_integration_test.py", line 206, in _CheckTestCompletion
      self.fail(self._WebGLTestMessages(self.tab))
  AssertionError: Unable to fetch WebGL rendering context for Canvas
  FAIL Unable to fetch WebGL rendering context for Canvas
  WebGL context does not exist
  FAIL WebGL context does not exist
  
[6527:6610:1117/014151.327733:WARNING:simple_synchronous_entry.cc(1251)] Could not open platform files for entry.
DevTools console [network]: Failed to load resource: the server responded with a status of 404 (File not found) http://127.0.0.1:45684/favicon.ico