* The 'mac' fallback path has been repurposed for 'mac12'. 'mac11'-only
baselines will go in 'platform/mac11'.
* Fix the reliability of the Mac version retrieved from the platform.
* Add 'Mac12*' to '*Expectations' headers.
Bug: 1323327
Change-Id: I8f600f798a1bca48d799224bbfcaf95f5f4fdaac
Cq-Include-Trybots: luci.chromium.try:mac10.13-blink-rel,mac10.14-blink-rel,mac10.15-blink-rel,mac11.0-blink-rel,mac11.0.arm64-blink-rel,mac12.0-blink-rel,mac12.0.arm64-blink-rel,win7-blink-rel
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3648124
Reviewed-by: Weizhong Xia <weizhong@google.com>
Commit-Queue: Jonathan Lee <jonathanjlee@google.com>
Reviewed-by: Erik Staab <estaab@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1007391}
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