Draft: fix TSAN issue by using lock in ColorGrading constructor (#3510)
Draft: fix TSAN issue by using lock in ColorGrading constructor (#3510)

This is a second attempt to fix Google3 TSAN failures seen inside of the ColorGrading constructor.

Related first attempt: #3462

google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament,google/filament