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By receiving into a threadsafe IOBufferPool, we can avoid extra memory
copies for things like audio streaming.

Bug: internal b/127963522
Test: cast_net_unittests
Change-Id: I86da6e7a5e07a7a3273d53485393468b4481ec94
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1822220
Commit-Queue: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700113}