Do not create a transform tree node for fixed layers

Do not create a transform tree node for fixed layers

This requirement was an error. Code behaves correctly without nodes for
these layers.

BUG=386810
Committed: https://crrev.com/72022234aa63d498b4d1a569c796614a37dc5064
Cr-Commit-Position: refs/heads/master@{#318644}

[Ian Vollick, 2015-03-01 23:51:56]

vollick@chromium.org changed reviewers:
+ enne@chromium.org

[enne (OOO), 2015-03-02 01:13:33]

The CQ bit was checked by enne@chromium.org

[enne (OOO), 2015-03-02 01:13:33]

lgtm

[enne (OOO), 2015-03-02 01:13:37]

The CQ bit was checked by enne@chromium.org

[enne (OOO), 2015-03-02 01:13:37]

lgtm

[commit-bot: I haz the power, 2015-03-02 01:25:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/970713003/1

[commit-bot: I haz the power, 2015-03-02 01:29:07]

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

[commit-bot: I haz the power, 2015-03-02 01:29:08]

Try jobs failed on following builders:
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)

[Ian Vollick, 2015-03-02 03:07:55]

The CQ bit was checked by vollick@chromium.org

[commit-bot: I haz the power, 2015-03-02 03:08:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/970713003/1

[commit-bot: I haz the power, 2015-03-02 03:18:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-02 03:18:43]

Patchset 1 (id:??) landed as
https://crrev.com/72022234aa63d498b4d1a569c796614a37dc5064
Cr-Commit-Position: refs/heads/master@{#318644}