Move LayerTreeHostImpl::SetVisible trace to "cc" from "webkit".

Move LayerTreeHostImpl::SetVisible trace to "cc" from "webkit".

Long live cc.

R=enne, vmpstr

Committed: https://crrev.com/8b42577feedfd9f2e229374e247293094d730120
Cr-Commit-Position: refs/heads/master@{#314684}

[vmpstr, 2015-02-04 22:35:35]

lgtm

[danakj, 2015-02-04 22:36:07]

The CQ bit was checked by danakj@chromium.org

[commit-bot: I haz the power, 2015-02-04 22:37:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/897873005/1

[commit-bot: I haz the power, 2015-02-04 23:16:26]

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

[commit-bot: I haz the power, 2015-02-04 23:16:27]

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

[danakj, 2015-02-04 23:18:06]

The CQ bit was checked by danakj@chromium.org

[commit-bot: I haz the power, 2015-02-04 23:19:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/897873005/1

[commit-bot: I haz the power, 2015-02-05 00:04:27]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-05 00:06:10]

Patchset 1 (id:??) landed as
https://crrev.com/8b42577feedfd9f2e229374e247293094d730120
Cr-Commit-Position: refs/heads/master@{#314684}