GitLab

This is a reland of 3a8d37c3

Reland fix:
 - Only adds the needed test data if `cros_sdk_version != ""`

That will prevent ebuild invocations from trying to add non-existant
items to data (since the ebuild doesn't use the cros chrome-sdk cache).

Original change's description:
> chromeos: Add only the current SDK version's items to a test's data.
>
> Instead of adding every version of a given item, this will add only the
> current version's. This is a bit tricky since individual versions of an
> item are keyed by symlink. And since isolate doesn't follow symlinks,
> we have to follow them ourselves.
>
> Bug: 1027382
> Change-Id: I6b3ea4ec15de3804e99fd6af768daac64f490d5b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1931155
> Commit-Queue: Ben Pastene <bpastene@chromium.org>
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#771959}

Bug: 1027382
Change-Id: I2ff8c8452f5f6f43e178d547e963b6f8b7d17166
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218581Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774341}