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Summary: Currently, queuing any sort of MountItem or getting the list of MountItems requires synchronization. Since these can be queued up at any point from the JS thread, there will, in theory, be constant contention between JS and UI thread. To see if this is true, I'm creating an experiment instead of just switching over to concurrent structures. After seeing results, we can hopefully make a decision and delete the non-concurrent stuff or improve on it somehow. Changelog: [Internal] Reviewed By: ejanzer Differential Revision: D24942110 fbshipit-source-id: fcbdeda51f91f4bd430a20d7484854fb1e94a832