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Some use cases, such as some implementations of realpath(), require
calling stat() on all intermediate dirs of a path, but otherwise
do not need to open or read those directories.

Bug=b:112486795
Test=sandbox_linux_unittests passed

Change-Id: Iea0bad8be9e238a854de383ac6dc5124f462ead3
Reviewed-on: https://chromium-review.googlesource.com/1185376Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Drew Davenport <ddavenport@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585586}