Revert of Moving background animation ticking from LayerTreeHostImpl into the Scheduler.

Revert of Moving background animation ticking from LayerTreeHostImpl into the Scheduler. (patchset #9 id:460001 of https://codereview.chromium.org/595973002/)

Reason for revert:
Reverting because of failure here http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%281%29

Will investigate tomorrow.

Original issue's description:
> Moving background animation ticking from LayerTreeHostImpl into the Scheduler.
>
> Background ticking currently happens in the LayerTreeHostImpl, this makes it very hard to preserve the monotonicity guarantee needed by frame times. http://crrev.com/267783004 set up the scheduler to become the source of background ticks and this CL makes use of that functionality.
>
> BUG=345459
>
> Committed: https://crrev.com/4df3c4366015739a7c6b6c1539a8d7c9198e38ef
> Cr-Commit-Position: refs/heads/master@{#302757}

TBR=danakj@chromium.org,brianderson@chromium.org,skyostil@chromium.org,ajuma@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=345459
Committed: https://crrev.com/8b794fe7e4eda70ec746f4e1ff15c3c3aec50ff3
Cr-Commit-Position: refs/heads/master@{#302763}

[mithro-old, 2014-11-05 07:35:58]

Created Revert of Moving background animation ticking from LayerTreeHostImpl
into the Scheduler.

[commit-bot: I haz the power, 2014-11-05 07:36:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/698413002/1

[commit-bot: I haz the power, 2014-11-05 07:42:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-05 07:44:11]

Patchset 1 (id:??) landed as
https://crrev.com/8b794fe7e4eda70ec746f4e1ff15c3c3aec50ff3
Cr-Commit-Position: refs/heads/master@{#302763}