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This intentionally CHECK-fails when shared memory allocation fails on
BigBuffer construction in the case where the buffer is would be too
large for IPC if inlined. This allows such cases to be disambiguated
from other large-IPC failures.

Bug: 872237
Change-Id: I518dbea3007094a3136bfa1449f85eaefbbc7171
Reviewed-on: https://chromium-review.googlesource.com/1208719Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589170}