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This is the logic of tracing the WebGPU API calls at the level of wgpu-core, serialized into a folder of choosing on the user drive. Traces are extremely portable, they can be shared (on BugZilla) and then replayed on the developer machine, which can have a different architecture from the users machine. The standalone player is introduced in `gfx/wgpu/player`, similar to WebRender's Wrench. The output dir is controlled by "dom.webgpu.traceDir" pref. No tracing happens if it's empty. Differential Revision: https://phabricator.services.mozilla.com/D73333