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Add thread check to all embedder to implementation calls.

Change-Id: Ifac0c0de5b2ea365313d151451cbff8ade7ab818
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879428Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709129}