[ozone] Enable display controller before notifying its users that it's available.

[ozone] Enable display controller before notifying its users that it's available.

We take away the controller when we suspend, but never successfully
give it back to window_delegate on resume because it's expected to be
in enabled state. The result was mouse cursor not getting reset on
resume.

BUG=446184
NOTRY=true

Committed: https://crrev.com/e2efa0f3e18b3502503b8370efb346e3bc55afae
Cr-Commit-Position: refs/heads/master@{#311581}

[alexst (slow to review), 2015-01-14 21:44:53]

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

[dnicoara, 2015-01-14 21:46:16]

lgtm

[dnicoara, 2015-01-15 00:06:29]

The CQ bit was checked by dnicoara@chromium.org

[commit-bot: I haz the power, 2015-01-15 00:07:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/845303004/1

[commit-bot: I haz the power, 2015-01-15 00:08:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-15 00:10:16]

Patchset 1 (id:??) landed as
https://crrev.com/e2efa0f3e18b3502503b8370efb346e3bc55afae
Cr-Commit-Position: refs/heads/master@{#311581}

[spang, 2015-01-16 23:49:37]

On 2015/01/15 00:10:16, I haz the power (commit-bot) wrote:
> Patchset 1 (id:??) landed as
> https://crrev.com/e2efa0f3e18b3502503b8370efb346e3bc55afae
> Cr-Commit-Position: refs/heads/master@{#311581}

Why is this landed under the latency bug?

There is literally nothing here that indicates it is related to that issue.

[alexst (slow to review), 2015-01-17 01:11:23]

On 2015/01/16 23:49:37, spang wrote:
> On 2015/01/15 00:10:16, I haz the power (commit-bot) wrote:
> > Patchset 1 (id:??) landed as
> > https://crrev.com/e2efa0f3e18b3502503b8370efb346e3bc55afae
> > Cr-Commit-Position: refs/heads/master@{#311581}
> 
> Why is this landed under the latency bug?
> 
> There is literally nothing here that indicates it is related to that issue.

It's a fix for https://codereview.chromium.org/844343002/, which itself was a
fix to a threading issue introduced by the cursor fast path.