Make trace processor metatrace thread local, not global#2000
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This makes it possible to use metatrace in a multi-threaded context, as long as we are careful.
LalitMaganti
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LalitMaganti
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olehkuznetsov
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This makes it possible to use metatrace in a multi-threaded context, as long as we are careful to only use each trace processor instance from a single thread. Bug: [427909201](https://b.corp.google.com/427909201)
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This makes it possible to use metatrace in a multi-threaded context, as long as we are careful to only use each trace processor instance from a single thread.
Bug: 427909201