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Currently, we can't use BackupRefPtr in renderers anyway due to severe
performance regressions. Therefore, add an option to disable the
allocator support for the per-allocation reference count slot and save
memory.

In order to do so, as soon as we can detect whether the current process
is a renderer, create a new partition with the desired set of flags
and replace the "temporary" one in the allocator shim. Previously made
allocations will keep using the old partition.

Bug: 1073933
Change-Id: Icb0d9359953c3b9b0cdc0c4ced113b4eca7a5c83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2449981Reviewed-by: Benoit L <lizeb@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Sergei Glazunov <glazunov@google.com>
Cr-Commit-Position: refs/heads/master@{#842138}