Simplify IOSurface CoreAnimation code: Part 1

Simplify IOSurface CoreAnimation code: Part 1

This is now only used in the context of the browser compositor, so
move the code there.

Move the software layer code over to compositor as well.

Rename structures to de-empahsize 'compositing' (everything is running
through the compositor now).

BUG=314190
TBR=kbr@chromium.org

Committed: https://crrev.com/9f9a14caa0da18e8cfe84a619c0f66f4b2901710
Cr-Commit-Position: refs/heads/master@{#292482}

[ccameron, 2014-08-28 17:25:57]

This is the non-functional half of https://codereview.chromium.org/490393002/

I've separated this from the other bit because I'm still struggling to reproduce
the trybot failures (& separating this out makes it easier).

[ccameron, 2014-08-28 17:26:01]

The CQ bit was checked by ccameron@chromium.org

[commit-bot: I haz the power, 2014-08-28 17:27:24]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ccameron@chromium.org/511923004/1

[commit-bot: I haz the power, 2014-08-28 17:27:24]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-08-28 17:27:25]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[ccameron, 2014-08-28 17:35:24]

The CQ bit was checked by ccameron@chromium.org

[commit-bot: I haz the power, 2014-08-28 17:36:45]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ccameron@chromium.org/511923004/1

[ccameron, 2014-08-28 18:11:17]

The CQ bit was unchecked by ccameron@chromium.org

[ccameron, 2014-08-28 19:15:57]

The CQ bit was checked by ccameron@chromium.org

[commit-bot: I haz the power, 2014-08-28 19:16:57]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ccameron@chromium.org/511923004/20001

[commit-bot: I haz the power, 2014-08-28 20:29:49]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  mac_chromium_rel_swarming on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[commit-bot: I haz the power, 2014-08-28 20:56:10]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-08-28 20:56:11]

Try jobs failed on following builders:
  mac_chromium_rel_swarming on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[ccameron, 2014-08-28 21:26:49]

The CQ bit was checked by ccameron@chromium.org

[commit-bot: I haz the power, 2014-08-28 21:27:34]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ccameron@chromium.org/511923004/20001

[commit-bot: I haz the power, 2014-08-28 22:42:35]

Committed patchset #2 (id:20001) as da9d2286b1176ce5ff20fe41580ba32a2f973076

[commit-bot: I haz the power, 2014-09-10 03:02:56]

Patchset 2 (id:??) landed as
https://crrev.com/9f9a14caa0da18e8cfe84a619c0f66f4b2901710
Cr-Commit-Position: refs/heads/master@{#292482}