What steps will reproduce the problem?
out/Release/chrome --enable-experimental-canvas-features --disable-gpu-compositing file:///<path-to-chromium-repo>/src/content/test/data/gpu/pixel_offscreenCanvas_webgl_commit_main.html

What is the expected result?
No errors in shell

What happens instead?

shell output (Ubuntu):

[32095:32095:0615/130745.464363:ERROR:gles2_cmd_decoder.cc(17688)] [.Offscreen-For-WebGL-0x14a5a5071a00]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name
[32095:32095:0615/130745.477039:ERROR:gles2_cmd_decoder.cc(17688)] [.Offscreen-For-WebGL-0x14a5a5070800]GL ERROR :GL_INVALID_OPERATION : glCreateAndConsumeTextureCHROMIUM: invalid mailbox name