Move blimp_layer_tree_settings.h/cc to client.

Move blimp_layer_tree_settings.h/cc to client.

These aren't needed by the engine, so I'm moving this to blimp/client
from blimp/common to fix an engine build error.

BUG=527655
Committed: https://crrev.com/2f3eb21a4d3a900cfaeb3663ed0a173e132fc5f3
Cr-Commit-Position: refs/heads/master@{#358721}

[David Trainor- moved to gerrit, 2015-11-09 23:33:44]

dtrainor@chromium.org changed reviewers:
+ wez@chromium.org

[Wez, 2015-11-09 23:37:13]

The CQ bit was checked by wez@chromium.org

[Wez, 2015-11-09 23:37:13]

lgtm

[commit-bot: I haz the power, 2015-11-09 23:39:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1420883006/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1420883006/20001

[commit-bot: I haz the power, 2015-11-10 00:54:29]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-11-10 00:55:27]

Patchset 2 (id:??) landed as
https://crrev.com/2f3eb21a4d3a900cfaeb3663ed0a173e132fc5f3
Cr-Commit-Position: refs/heads/master@{#358721}