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IOBufferPool is a class that allocates fixed-size IOBuffers. There is
an optional limit on the maximum number of buffers that will be allocated.
Buffers from the pool can be used as usual; when they are deleted, the memory
will be returned to the pool to be reused. Buffers can be safely used and
freed even after the IOBufferPool instance is destroyed.

IOBufferPool is optionally threadsafe (defaults to non-threadsafe). When
thread safety is enabled, the pool and allocated buffers can be used from
any sequence. If thread safety is not enabled, the pool and buffers may only
be used from the sequence that created IOBufferPool.

Change-Id: I901c70bbb0f7dca1395886246209e0aeb6805151
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1805866
Commit-Queue: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697012}