The enablement of PAC in Chromium will have two phases where support
will first be enabled on C++ code (e.g. Blink/Chrome/etc) and its
dependencies, followed next by support for dynamic code generated by
V8.

This change will allow enable PAC support for C++ code when V8
is built with Chromium.

Bug: chromium:919548
Change-Id: I8ebcbcfe3c2a3a38807b814f936272ac09625795
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3372162Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Adenilson Cavalcanti <cavalcantii@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78548}