Update DesktopCanvas to allow over-panning when Soft Input Method is present.

Update DesktopCanvas to allow over-panning when Soft Input Method is present.

My previous change allowed the user to 'over-pan' the desktop image such
that it can be pulled out from under any System UI present.  After using
the feature a bit and tqalking with other folks on the team, I think
this behavior should be restricted to only be allowed when a Soft Input
Method is present.

BUG=654565
Review-Url: https://codereview.chromium.org/2411503002
Cr-Commit-Position: refs/heads/master@{#424506}
(cherry picked from commit 99f909132e4756059b6414b723beadd72453a71c)

Committed: https://chromium.googlesource.com/chromium/src/+/65c8ec0c0d3d8d3c79096a2bba6ae3b80da2d951

[joedow, 2016-10-11 22:51:20]

Description was changed from

==========
Update DesktopCanvas to allow over-panning when Soft Input Method is present.

My previous change allowed the user to 'over-pan' the desktop image such
that it can be pulled out from under any System UI present.  After using
the feature a bit and tqalking with other folks on the team, I think
this behavior should be restricted to only be allowed when a Soft Input
Method is present.

BUG=654565

Review-Url: https://codereview.chromium.org/2411503002
Cr-Commit-Position: refs/heads/master@{#424506}
(cherry picked from commit 99f909132e4756059b6414b723beadd72453a71c)
==========

to

==========
Update DesktopCanvas to allow over-panning when Soft Input Method is present.

My previous change allowed the user to 'over-pan' the desktop image such
that it can be pulled out from under any System UI present.  After using
the feature a bit and tqalking with other folks on the team, I think
this behavior should be restricted to only be allowed when a Soft Input
Method is present.

BUG=654565

Review-Url: https://codereview.chromium.org/2411503002
Cr-Commit-Position: refs/heads/master@{#424506}
(cherry picked from commit 99f909132e4756059b6414b723beadd72453a71c)

Committed:
https://chromium.googlesource.com/chromium/src/+/65c8ec0c0d3d8d3c79096a2bba6a...
==========

[joedow, 2016-10-11 22:51:21]

Committed patchset #1 (id:1) manually as
65c8ec0c0d3d8d3c79096a2bba6ae3b80da2d951.