claincly cb0bc28af2 Simplify concurrency in FrameProcessingTaskExecutor
This CL replaces concurrent collections and atomic primitives with a single
lock, this way the code is easier to reason about.

PiperOrigin-RevId: 496718057
2022-12-21 15:32:00 +00:00
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2022-12-21 15:02:20 +00:00