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When PartitionAlloc is malloc(), the thread cache is used by malloc(),
otherwise by the FastMalloc partition. Record its size in UMA for both
cases.

Bug: 998048
Change-Id: I9072890b76c2c125409ae44e956913ef5bfe26e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2549964Reviewed-by: ssid <ssid@chromium.org>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829606}