Null-check scrollable area when invalidating sticky constraints.

Null-check scrollable area when invalidating sticky constraints.

BUG=678452
Review-Url: https://codereview.chromium.org/2617433005
Cr-Commit-Position: refs/heads/master@{#441983}
Committed: https://chromium.googlesource.com/chromium/src/+/ba85a156e1974f8efabe02594e2abf23726a9462

[chrishtr, 2017-01-06 00:44:38]

Description was changed from

==========
none


none

BUG=
==========

to

==========
Null-check scrollable area when invalidating sticky constraints.

BUG=678452
==========

[chrishtr, 2017-01-06 00:45:11]

chrishtr@chromium.org changed reviewers:
+ wkorman@chromium.org

[wkorman, 2017-01-06 02:42:38]

lgtm

[chrishtr, 2017-01-06 16:38:15]

The CQ bit was checked by chrishtr@chromium.org

[commit-bot: I haz the power, 2017-01-06 16:38:37]

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, 2017-01-06 18:27:35]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1483720695290720, "parent_rev":
"7c2f39bf9c9698057339ee8b19272694eceb1ab6", "commit_rev":
"ba85a156e1974f8efabe02594e2abf23726a9462"}

[commit-bot: I haz the power, 2017-01-06 18:28:10]

Description was changed from

==========
Null-check scrollable area when invalidating sticky constraints.

BUG=678452
==========

to

==========
Null-check scrollable area when invalidating sticky constraints.

BUG=678452

Review-Url: https://codereview.chromium.org/2617433005
Cr-Commit-Position: refs/heads/master@{#441983}
Committed:
https://chromium.googlesource.com/chromium/src/+/ba85a156e1974f8efabe02594e2a...
==========

[commit-bot: I haz the power, 2017-01-06 18:28:13]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/ba85a156e1974f8efabe02594e2a...