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Attribute is needed for some debug functions in Xcode
(e.g. simulated MetricKit payload).

Change-Id: I6ee8456a7dd4bc1ecc9e3ebc4e31526b2c5ad506
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144039Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760051}