[2/2][Ozone-Drm] Scan for displays on browser size during startup

[Ozone-Drm] Scan for displays on browser size during startup

During startup, Chrome expects synchronous display configuration, so we
need to present the list of displays before we get a chance to connect
to the GPU process. This patch will populate a list of dummy displays on
startup and the platform will pretend it can configure them until the
connection to the GPU process is established.

BUG=484294
Committed: https://crrev.com/0e7b023c57f519dd76a8cc7fc92fca8fb266f3be
Cr-Commit-Position: refs/heads/master@{#329786}

[dnicoara, 2015-05-11 19:03:52]

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

[spang, 2015-05-13 21:14:39]

lgtm

[dnicoara, 2015-05-14 02:01:30]

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

[commit-bot: I haz the power, 2015-05-14 02:02:50]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1131813003/60001

[commit-bot: I haz the power, 2015-05-14 02:34:17]

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

[commit-bot: I haz the power, 2015-05-14 02:34:18]

Dry run: This issue passed the CQ dry run.

[dnicoara, 2015-05-14 02:43:58]

The CQ bit was checked by dnicoara@chromium.org

[commit-bot: I haz the power, 2015-05-14 02:44:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1131813003/60001

[commit-bot: I haz the power, 2015-05-14 02:47:55]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-05-14 02:48:45]

Patchset 4 (id:??) landed as
https://crrev.com/0e7b023c57f519dd76a8cc7fc92fca8fb266f3be
Cr-Commit-Position: refs/heads/master@{#329786}