Moves FrameDecorations from Display to WindowManagerState

Moves FrameDecorations from Display to WindowManagerState

The FrameDecoration values come from the windowmanager, which is per
user. So, move FrameDecorations from Display to WindowManagerState.
This also introduces a UserDisplayManager to track the per user
display state.

BUG=590955
TEST=covered by tests
R=ben@chromium.org

Committed: https://crrev.com/407d2458d1294dd019b6aec72aba33e4777bad37
Cr-Commit-Position: refs/heads/master@{#379668}

[Ben Goodger (Google), 2016-03-07 21:42:44]

lgtm

[sky, 2016-03-07 21:51:27]

The CQ bit was checked by sky@chromium.org

[sky, 2016-03-07 21:51:27]

The patchset sent to the CQ was uploaded after l-g-t-m from ben@chromium.org
Link to the patchset: https://codereview.chromium.org/1775583002/#ps40001
(title: "override")

[commit-bot: I haz the power, 2016-03-07 21:52:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1775583002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1775583002/40001

[commit-bot: I haz the power, 2016-03-07 22:34:17]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-03-07 22:35:15]

Description was changed from

==========
Moves FrameDecorations from Display to WindowManagerState

The FrameDecoration values come from the windowmanager, which is per
user. So, move FrameDecorations from Display to WindowManagerState.
This also introduces a UserDisplayManager to track the per user
display state.

BUG=590955
TEST=covered by tests
R=ben@chromium.org
==========

to

==========
Moves FrameDecorations from Display to WindowManagerState

The FrameDecoration values come from the windowmanager, which is per
user. So, move FrameDecorations from Display to WindowManagerState.
This also introduces a UserDisplayManager to track the per user
display state.

BUG=590955
TEST=covered by tests
R=ben@chromium.org

Committed: https://crrev.com/407d2458d1294dd019b6aec72aba33e4777bad37
Cr-Commit-Position: refs/heads/master@{#379668}
==========

[commit-bot: I haz the power, 2016-03-07 22:35:15]

Patchset 3 (id:??) landed as
https://crrev.com/407d2458d1294dd019b6aec72aba33e4777bad37
Cr-Commit-Position: refs/heads/master@{#379668}