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Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/44818 Introduce a new data source for Perfetto. This one turns on the Hermes sampler, and at the end we flush the state to Perfetto. This provides JS sampling data in Perfetto traces that can be used to easily spot JS performance problems not otherwise obvious. Reviewed By: javache Differential Revision: D57226087 fbshipit-source-id: 77c4a335bb462e73d74345eedc3fa634405bfd0f