GitLab

Bring back synthetic PartitionAllocEverywhere experiment, scheduled for
1/8.

Also add synthetic BackupRefPtrAndPCScan experiment, scheduled for 1/12.
This requires disabling PCScan when BackupRefPtr is in use.

Bug: 1073933, 11297512
Change-Id: I5a575c4d60ff6d6eb196e0508851f279ce1fb7c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612307Reviewed-by: Sébastien Marchand <sebmarchand@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840943}