[Ozone-Drm] Add log message when the DRM device is authenticated

[Ozone-Drm] Add log message when the DRM device is authenticated

It makes it possible to tell if the GPU process is stuck waiting
for a DRM device to authenticate.

BUG=476728
Committed: https://crrev.com/179679f9298c3cf69568f23274e652012aed7967
Cr-Commit-Position: refs/heads/master@{#325486}

[dnicoara, 2015-04-16 18:14:52]

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

[alexst (slow to review), 2015-04-16 18:23:16]

lgtm

[dnicoara, 2015-04-16 18:23:31]

The CQ bit was checked by dnicoara@chromium.org

[dnicoara, 2015-04-16 18:24:47]

The CQ bit was unchecked by dnicoara@chromium.org

[commit-bot: I haz the power, 2015-04-16 18:24:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1086353003/1

[dnicoara, 2015-04-16 18:24:54]

The CQ bit was checked by dnicoara@chromium.org

[dnicoara, 2015-04-16 18:25:06]

The CQ bit was unchecked by dnicoara@chromium.org

[dnicoara, 2015-04-16 18:25:25]

The CQ bit was checked by dnicoara@chromium.org

[commit-bot: I haz the power, 2015-04-16 18:26:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1086353003/1

[commit-bot: I haz the power, 2015-04-16 19:04:36]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-16 19:05:39]

Patchset 1 (id:??) landed as
https://crrev.com/179679f9298c3cf69568f23274e652012aed7967
Cr-Commit-Position: refs/heads/master@{#325486}