Add test coverage for macOS printing Open PDF in Preview

The macOS platform has an extra printing destination option in the
Print Preview, to generate a PDF and open that in the Preview
application.

Update TestPrintingContext to include ability to track such a request.
Utilize this from a new browser test that exercises this print type.

Test: on macOS for *SystemAccessProcess*Print*BrowserTest*
Fixed: 1473359
Change-Id: I935cbbbb2937cfa7197b6f4af096b3ae63780330
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4786630
Commit-Queue: Alan Screen <awscreen@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1184763}