In-band track `startTimeVariance` is passed from the GPU process but not used in the Web process.
rdar://77326202
Created attachment 429924 [details] Patch
Comment on attachment 429924 [details] Patch The Windows failure is unrelated: C:\cygwin\home\buildbot\worker\Windows-EWS\build\WebKitBuild\Release\DerivedSources\WebCore\unified-sources\UnifiedSource-f74e0903-2.cpp(9,1): fatal error C1051: program database file, 'C:\cygwin\home\buildbot\worker\Windows-EWS\build\WebKitBuild\Release\lib64\WebCore.pdb', has an obsolete format, delete it and recompile [C:\cygwin\home\buildbot\worker\Windows-EWS\build\WebKitBuild\Release\Source\WebCore\WebCore.vcxproj]
Committed r278197 (238240@main): <https://commits.webkit.org/238240@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 429924 [details].