Revert of cc: Remove IOSurface explicit support in VideoLayerImpl.

Revert of cc: Remove IOSurface explicit support in VideoLayerImpl. (patchset #1 id:1 of https://codereview.chromium.org/1149873010/)

Reason for revert:
Speculatively reverting this as the only suspect of breaking Mac WebGL tests in https://build.chromium.org/p/chromium.gpu/builders/Mac%20Release%20%28Intel%29/builds/51919 and https://build.chromium.org/p/chromium.gpu/builders/Mac%20Retina%20Release/builds/39021

Your sheriff

Original issue's description:
> cc: Remove IOSurface support in VideoLayerImpl.
>
> VideoFrame backed by IOSurfaces are not used for playback at the moment.
> Support for IOSurfaces will be available via GpuMemoryBuffers.
>
> This CL removes the explicit support for IOSurfaces from VideoLayerImpl.
>
> BUG=
> CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
>
> Committed: https://crrev.com/ef2b44689b9a4cc231a8546a27a6da498b4cd39d
> Cr-Commit-Position: refs/heads/master@{#332088}

TBR=jfroy@chromium.org,danakj@chromium.org,dcastagna@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/adf797a58dababb597451f6c0302e32d41188a5e
Cr-Commit-Position: refs/heads/master@{#332167}

[vabr (Chromium), 2015-06-01 07:40:59]

Created Revert of cc: Remove IOSurface explicit support in VideoLayerImpl.

[commit-bot: I haz the power, 2015-06-01 07:41:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1162443005/1

[commit-bot: I haz the power, 2015-06-01 07:42:00]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-01 07:42:59]

Patchset 1 (id:??) landed as
https://crrev.com/adf797a58dababb597451f6c0302e32d41188a5e
Cr-Commit-Position: refs/heads/master@{#332167}

[vabr (Chromium), 2015-06-01 10:31:52]

On 2015/06/01 07:42:59, commit-bot: I haz the power wrote:
> Patchset 1 (id:??) landed as
> https://crrev.com/adf797a58dababb597451f6c0302e32d41188a5e
> Cr-Commit-Position: refs/heads/master@{#332167}

Revert worked, more details in http://crbug.com/494964.