[ozone] Add stub async swap buffers implementation to ozone surfaceless.

[ozone] Add stub implementation to ozone surfaceless to avoid hitting the DCHECK and allow the platform implementation to handle async swap properly.

BUG=445977
Committed: https://crrev.com/409e3e02bfc1d3d2b20b7a2e5eb725289cf90022
Cr-Commit-Position: refs/heads/master@{#309969}

[alexst (slow to review), 2015-01-05 16:10:46]

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

[alexst (slow to review), 2015-01-05 17:06:02]

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

[spang, 2015-01-05 19:27:32]

lgtm

https://codereview.chromium.org/837483003/diff/20001/ui/ozone/public/surface_...
File ui/ozone/public/surface_ozone_egl.h (right):

https://codereview.chromium.org/837483003/diff/20001/ui/ozone/public/surface_...
ui/ozone/public/surface_ozone_egl.h:42: typedef base::Callback<void()>
SwapCompletionCallback;
base::Closure

[alexst (slow to review), 2015-01-05 21:38:24]

The CQ bit was checked by alexst@chromium.org

[commit-bot: I haz the power, 2015-01-05 21:39:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/837483003/40001

[commit-bot: I haz the power, 2015-01-05 22:20:54]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-01-05 22:22:33]

Patchset 3 (id:??) landed as
https://crrev.com/409e3e02bfc1d3d2b20b7a2e5eb725289cf90022
Cr-Commit-Position: refs/heads/master@{#309969}