[WeakRefs] Implement WeakRefs integration #19998
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This uses the V8 API to register a clean up task that will execute
some time later at idle time.
The JavaScript spec is defined here:
https://tc39.es/proposal-weakrefs/
The HTML integration is defined here:
whatwg/html#4571
(Note that this CL doesn't implement ClearKeptObjects part of the
spec yet, a follow on CL will do that.)
TODO (before sumbitting this CL):
Bug: 1016767
Change-Id: I2db82dc9d037d1e3bc0ec8c192d5b06908161adc
Reviewed-on: https://chromium-review.googlesource.com/1873754
WPT-Export-Revision: 905ae5e21d28f9fe8f184a0f4cc6617669f952f1