aura: Add missing test file to ozone GN build

aura: Add missing test file to ozone GN build

It is already in the GYP build.

BUG=445627
TEST=gn gen out_gn_ozone --args='os="chromeos" use_ozone=true is_component_build=true' &&
  ninja -C out_gn_ozone chrome ozone_unittests (along with other needed changes)

Committed: https://crrev.com/6f171acafbe8b796db44691e1bafecb2319f4e01
Cr-Commit-Position: refs/heads/master@{#314595}

[spang, 2015-02-04 01:08:31]

spang@chromium.org changed reviewers:
+ sky@chromium.org

[sky, 2015-02-04 18:05:22]

LGTM

[spang, 2015-02-04 18:05:58]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2015-02-04 18:06:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/899723003/1

[commit-bot: I haz the power, 2015-02-04 18:47:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-04 18:48:10]

Patchset 1 (id:??) landed as
https://crrev.com/6f171acafbe8b796db44691e1bafecb2319f4e01
Cr-Commit-Position: refs/heads/master@{#314595}

[commit-bot: I haz the power, 2015-02-04 18:48:20]

Patchset 1 (id:??) landed as
https://crrev.com/6f171acafbe8b796db44691e1bafecb2319f4e01
Cr-Commit-Position: refs/heads/master@{#314595}