Moving logic for System UI state changes into DesktopCanvas class

Moving logic for System UI state changes into DesktopCanvas class

Most of the logic for reacting to System UI changes was already in the
DesktopCanvaqs class however there was one boolean check outside of
that.  Instead of adding yet another parameter to the DesktopCanvas
handler method, I now pass the event parameters themselves.  This will
allow future changes to the logic to be made solely in the DesktopCanvas
class.

BUG=654565
Review-Url: https://codereview.chromium.org/2410613003
Cr-Commit-Position: refs/heads/master@{#424284}
(cherry picked from commit 77a6c664de52f6a28910ab585a347ed0f4c2d899)

Committed: https://chromium.googlesource.com/chromium/src/+/48c4493746716ffec1fae380abc80583b6fc2326

[joedow, 2016-10-11 22:36:36]

Description was changed from

==========
Moving logic for System UI state changes into DesktopCanvas class

Most of the logic for reacting to System UI changes was already in the
DesktopCanvaqs class however there was one boolean check outside of
that.  Instead of adding yet another parameter to the DesktopCanvas
handler method, I now pass the event parameters themselves.  This will
allow future changes to the logic to be made solely in the DesktopCanvas
class.

BUG=654565

Review-Url: https://codereview.chromium.org/2410613003
Cr-Commit-Position: refs/heads/master@{#424284}
(cherry picked from commit 77a6c664de52f6a28910ab585a347ed0f4c2d899)
==========

to

==========
Moving logic for System UI state changes into DesktopCanvas class

Most of the logic for reacting to System UI changes was already in the
DesktopCanvaqs class however there was one boolean check outside of
that.  Instead of adding yet another parameter to the DesktopCanvas
handler method, I now pass the event parameters themselves.  This will
allow future changes to the logic to be made solely in the DesktopCanvas
class.

BUG=654565

Review-Url: https://codereview.chromium.org/2410613003
Cr-Commit-Position: refs/heads/master@{#424284}
(cherry picked from commit 77a6c664de52f6a28910ab585a347ed0f4c2d899)

Committed:
https://chromium.googlesource.com/chromium/src/+/48c4493746716ffec1fae380abc8...
==========

[joedow, 2016-10-11 22:36:37]

Committed patchset #1 (id:1) manually as
48c4493746716ffec1fae380abc80583b6fc2326.