A variety of features may be used to externally synchronize usage of resources on the GPU.
wgpu::FeatureName::SharedFenceVkSemaphoreOpaqueFD
wgpu::FeatureName::SharedFenceVkSemaphoreSyncFD
wgpu::FeatureName::SharedFenceVkSemaphoreZirconHandle
wgpu::FeatureName::SharedFenceDXGISharedHandle
wgpu::FeatureName::SharedFenceMTLSharedEvent
TODO(crbug.com/dawn/1745): additional documentation
Work-in-progress: https://docs.google.com/document/d/1uRGL6vE1mSbpWd2v_KU5--RT5EjTXtruwiC7Ri3ZKz4/edit