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This allows the runner to capture the contents of this directory
from the device. The directory is used by ANGLE tests to produce
images for Skia Gold.

Bug: angleproject:4090
Bug: b/168049670
Change-Id: I10a669c21357366a2535d13d5f578771b52e8612
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434088
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811445}