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Directories "metrics" and "vr" have errors. All the other directories
are enumerated because gn doesn't support negative list.

Bug: 367595
Change-Id: If009fa36916dacd9d67aea95a6b22b13c9e37919
Reviewed-on: https://chromium-review.googlesource.com/1164579Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581292}