Change Viewport calculations to use screen size without System UI

Change Viewport calculations to use screen size without System UI

This change updates code used to calculate the size of the viewport.  In
the past we would subtract the System UI edges from the viewport size
which could cause odd problems when allowing the canvas to be moved out
from under the System UI.

BUG=621633
Committed: https://crrev.com/6f267f635b978d7f4fe4899c302c2126978dc102
Cr-Commit-Position: refs/heads/master@{#420949}

[joedow, 2016-09-26 15:53:57]

The CQ bit was checked by joedow@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-26 15:54:22]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-26 16:09:11]

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

[commit-bot: I haz the power, 2016-09-26 16:09:12]

Dry run: This issue passed the CQ dry run.

[joedow, 2016-09-26 17:17:53]

joedow@chromium.org changed reviewers:
+ lambroslambrou@chromium.org

[joedow, 2016-09-26 17:17:54]

This is the first of ~4 CLs to allow users to pan the desktop canvas out from
under System UI.

In this CL, I am changing our viewport calculations to use the size of the
screen instead of the visible area.  This change simplifies padding calculations
made in future CLs.

PTAL!

Thanks,
Joe

[Lambros, 2016-09-26 18:36:29]

lgtm

[joedow, 2016-09-26 18:41:06]

The CQ bit was checked by joedow@chromium.org

[commit-bot: I haz the power, 2016-09-26 18:41:40]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-26 18:47:54]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-26 18:49:39]

Description was changed from

==========
Change Viewport calculations to use screen size without System UI

This change updates code used to calculate the size of the viewport.  In
the past we would subtract the System UI edges from the viewport size
which could cause odd problems when allowing the canvas to be moved out
from under the System UI.

BUG=621633
==========

to

==========
Change Viewport calculations to use screen size without System UI

This change updates code used to calculate the size of the viewport.  In
the past we would subtract the System UI edges from the viewport size
which could cause odd problems when allowing the canvas to be moved out
from under the System UI.

BUG=621633

Committed: https://crrev.com/6f267f635b978d7f4fe4899c302c2126978dc102
Cr-Commit-Position: refs/heads/master@{#420949}
==========

[commit-bot: I haz the power, 2016-09-26 18:49:40]

Patchset 1 (id:??) landed as
https://crrev.com/6f267f635b978d7f4fe4899c302c2126978dc102
Cr-Commit-Position: refs/heads/master@{#420949}