ozone: dri: Fix undefined references in DRI platform GN build

ozone: dri: Fix undefined references in DRI platform GN build

We need to export everything that is used by the tests and fix the test
target to depend on //ui/ozone instead of directly on the platform
source_set. The latter builds a copy of the platform directly into the
test binary, creating unresolved references to other parts of
//ui/ozone.

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/349b8fae7983101c7f77c56b9a3ed973f22d5358
Cr-Commit-Position: refs/heads/master@{#314607}

[spang, 2015-02-04 01:06:46]

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

[dnicoara, 2015-02-04 15:14:49]

Should we do the same thing for the GYP build, just to stay consistent?

[spang, 2015-02-04 17:40:47]

On 2015/02/04 15:14:49, dnicoara wrote:
> Should we do the same thing for the GYP build, just to stay consistent?

yep done.

[dnicoara, 2015-02-04 17:41:32]

lgtm

[spang, 2015-02-04 18:40:09]

The CQ bit was checked by spang@chromium.org

[commit-bot: I haz the power, 2015-02-04 18:40:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/886323004/20001

[commit-bot: I haz the power, 2015-02-04 19:21:07]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-04 19:22:03]

Patchset 2 (id:??) landed as
https://crrev.com/349b8fae7983101c7f77c56b9a3ed973f22d5358
Cr-Commit-Position: refs/heads/master@{#314607}