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This CL adds accounting for the thread cache, and surfaces the data in
about:tracing when the thread cache is used for the FastMalloc()
partition. The recorded data shows that for FastMalloc(), the current
settings catch the vast majority of allocations, at a small memory cost,
and that most allocations are on the main threads, as expected for
FastMalloc().

Bug: 998048
Change-Id: Iaa55deb12f0c04dd7f301e15c7497b817f4843e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424309
Commit-Queue: Benoit L <lizeb@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809774}