aw: Add test to ensure hardware mode works

aw: Add test to ensure hardware mode works

We might accidentally turn off hardware acceleration in instrumentation
tests without knowing since tests are supposed to work in software mode
as well. So add a meta test to check this.

BUG=

Committed: https://crrev.com/8aa9b775556f58cfddb77dcafc28e28e22de6732
Cr-Commit-Position: refs/heads/master@{#302690}

[boliu, 2014-11-04 21:46:41]

boliu@chromium.org changed reviewers:
+ sievers@chromium.org

[boliu, 2014-11-04 21:46:41]

ptal

[no sievers, 2014-11-04 21:50:47]

lgtm

[boliu, 2014-11-04 21:51:26]

The CQ bit was checked by boliu@chromium.org

[commit-bot: I haz the power, 2014-11-04 21:52:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/687803009/20001

[commit-bot: I haz the power, 2014-11-04 22:38:43]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-11-04 22:40:00]

Patchset 2 (id:??) landed as
https://crrev.com/8aa9b775556f58cfddb77dcafc28e28e22de6732
Cr-Commit-Position: refs/heads/master@{#302690}