Timeline: fix exception when clicking on drawer padding with collapsible groups enabled

Timeline: fix exception when clicking on drawer padding with collapsible groups enabled

also: avoid drawing last group padding shadow when no groups are specified.

BUG=592363
Committed: https://crrev.com/c0cecb3e3d9551c8a80937fc9a37c94712d40275
Cr-Commit-Position: refs/heads/master@{#380457}

[caseq, 2016-03-10 00:56:20]

caseq@chromium.org changed reviewers:
+ alph@chromium.org

[caseq, 2016-03-10 01:24:06]

Patchset #1 (id:1) has been deleted

[caseq, 2016-03-10 01:36:17]

Description was changed from

==========
Timeline: fix exception when clicking on drawer padding with collapsible groups
enabled
==========

to

==========
Timeline: fix exception when clicking on drawer padding with collapsible groups
enabled

also: avoid drawing last group padding shadow when no groups are specified.

BUG=592363
==========

[alph, 2016-03-10 17:29:17]

lgtm

[alph, 2016-03-10 17:29:22]

The CQ bit was checked by alph@chromium.org

[commit-bot: I haz the power, 2016-03-10 17:30:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1782713002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1782713002/20001

[commit-bot: I haz the power, 2016-03-10 20:49:13]

Description was changed from

==========
Timeline: fix exception when clicking on drawer padding with collapsible groups
enabled

also: avoid drawing last group padding shadow when no groups are specified.

BUG=592363
==========

to

==========
Timeline: fix exception when clicking on drawer padding with collapsible groups
enabled

also: avoid drawing last group padding shadow when no groups are specified.

BUG=592363
==========

[commit-bot: I haz the power, 2016-03-10 20:49:14]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2016-03-10 20:50:50]

Description was changed from

==========
Timeline: fix exception when clicking on drawer padding with collapsible groups
enabled

also: avoid drawing last group padding shadow when no groups are specified.

BUG=592363
==========

to

==========
Timeline: fix exception when clicking on drawer padding with collapsible groups
enabled

also: avoid drawing last group padding shadow when no groups are specified.

BUG=592363

Committed: https://crrev.com/c0cecb3e3d9551c8a80937fc9a37c94712d40275
Cr-Commit-Position: refs/heads/master@{#380457}
==========

[commit-bot: I haz the power, 2016-03-10 20:50:51]

Patchset 1 (id:??) landed as
https://crrev.com/c0cecb3e3d9551c8a80937fc9a37c94712d40275
Cr-Commit-Position: refs/heads/master@{#380457}