Add a path into embedder tracing on allocation. This is safe as as Blink
is not allowed to call into V8 during object construction.

This is a reland of caed2cc0.

Bug: chromium:843903
Change-Id: I7faa8413966f6b4d37f19b235d46bb09e4d47235
Bug: chromium:843903
Reviewed-on: https://chromium-review.googlesource.com/c/1349330
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57770}