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Previously we used to skip first allocation on each thread.
That accounts for certain amount of memory, especially when there
are lots of threads.

BUG=1007491

Change-Id: Ibe990c6094355183833fdfc598a0e8c0196a8aaf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825727
Commit-Queue: Alexei Filippov <alph@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700028}