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This CL adds support for the 'use_allocator = "partition"' GN argument
on Android and Linux. This is not meant to ship, but to ease
experimentation. Without this flag, there is no behavior change. With
it, malloc() and new calls are redirected to PartitionAlloc.

For DCHECK_IS_ON() builds, PartitionAlloc doesn't support the right
alignment guarantees to suppose posix_memalign(), which is required at
least on Linux. This is due to the addition of a "cookie" on both sides
of the allocation, meant to detect improper memory writes. With this CL,
the cookies are temporarily disabled with PartitionAlloc when it is used
as the malloc() implementation.

Change-Id: I1b1b6fc855fb48bbad04a82a2b60e320194943fd
Bug: 998048
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2167281
Commit-Queue: Benoit L <lizeb@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#776916}