Correctly handle SurfaceDisplayOutputSurface::SwapBuffers with empty frame.

Correctly handle SurfaceDisplayOutputSurface::SwapBuffers with empty frame.

This can happen temporarily on compositor creation, so ensure a surface is created before attempting to use it.

BUG=461569, 461491
Committed: https://crrev.com/43ad5f2c3eb7466f8a08952cc5dff15931d9126e
Cr-Commit-Position: refs/heads/master@{#318166}

[jbauman, 2015-02-26 00:47:12]

jbauman@chromium.org changed reviewers:
+ jamesr@chromium.org

[jamesr, 2015-02-26 00:54:35]

lgtm

[jamesr, 2015-02-26 00:54:44]

Although arguably this is a caller bug.

[jbauman, 2015-02-26 01:02:31]

The CQ bit was checked by jbauman@chromium.org

[commit-bot: I haz the power, 2015-02-26 01:03:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/949413002/1

[commit-bot: I haz the power, 2015-02-26 01:12:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-26 01:13:45]

Patchset 1 (id:??) landed as
https://crrev.com/43ad5f2c3eb7466f8a08952cc5dff15931d9126e
Cr-Commit-Position: refs/heads/master@{#318166}