Some build configs may be run on machines where `dirmd` won't work
correctly, and so we add the ability to turn off that glcient hook
altogether.
It is still possible to generate the metadata but not include it
in the test isolate on a build-by-build basis via a GN arg as well.
Bug: 1218056
Change-Id: I9b115fe26bbff5ba2b459c427e9a84c5dc43c956
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2957335
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Michael Moss <mmoss@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#892228}
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