partition_alloc: Check support for C++17

Currently, partition_alloc uses some C++20, which prevents using it in
embedders that do not yet switched over. For instance: Skia.

This patch adds a presubmit prompt warning. It will be turned into an
error once I fixed the errors:
https://paste.googleplex.com/6416285655367680

Bug: 344963951
Change-Id: I3876cbbb06db1f19ca528f788e5490783863a510
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5598864
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1324505}
NOKEYCHECK=True
GitOrigin-RevId: 290e717736441f97af400dae6d28f35ce710f2ad
1 file changed