[native] Use thread watcher hook
[native] Use thread watcher hook

Test Plan: Switched threads couple of times and checked using console log in thread watcher if watchedID map had correct values

Reviewers: ashoat

Reviewed By: ashoat

Subscribers: KatPo, zrebcu411, Adrian, atul, subnub

Differential Revision: https://phabricator.ashoat.com/D820

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