[Ozone] Update GPUTestHelper to properly use the message filter

[Ozone] Update GPUTestHelper to properly use the message filter

Normally messages sent to the GPU process are first passed on the IO
thread to the message filter. If they aren't handled by the filter they
are then forwarded to the GPU main thread. This patch adds the ability
to handle the messages in the filter before sending it to the GPU main
thread.

BUG=536113
Committed: https://crrev.com/18c866f9299f102e617b983ee6f611c6e2aa371d
Cr-Commit-Position: refs/heads/master@{#353797}

[dnicoara, 2015-10-05 18:59:29]

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

[dnicoara, 2015-10-09 15:32:23]

The CQ bit was checked by dnicoara@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-10-09 15:35:06]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1308993007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1308993007/1

[commit-bot: I haz the power, 2015-10-09 15:59:38]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-10-09 15:59:39]

Dry run: This issue passed the CQ dry run.

[spang, 2015-10-13 17:36:38]

lgtm

[dnicoara, 2015-10-13 17:37:49]

The CQ bit was checked by dnicoara@chromium.org

[commit-bot: I haz the power, 2015-10-13 17:57:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1308993007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1308993007/1

[commit-bot: I haz the power, 2015-10-13 18:24:26]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-13 18:25:27]

Patchset 1 (id:??) landed as
https://crrev.com/18c866f9299f102e617b983ee6f611c6e2aa371d
Cr-Commit-Position: refs/heads/master@{#353797}