[Layout API] Create api/LayoutLIItem and use it in html/HTMLLIElement

[Layout API] Create api/LayoutLIItem and use it in html/HTMLLIElement

This adds LayoutLIItem as a descendant of LayoutBoxItem (there is
currently no LayoutBlockFlowItem) in the new layout API and provides
1 method, setNotInList(), which is used from HTMLLIElement::attach.

There are no functional changes.

BUG=499321
Committed: https://crrev.com/1170487b35230f1e8dc2bcc3aad6aa5d266ca3f3
Cr-Commit-Position: refs/heads/master@{#379093}

[pilgrim_google, 2016-03-03 16:10:53]

pilgrim@chromium.org changed reviewers:
+ eae@chromium.org, jsbell@chromium.org, leviw@chromium.org, ojan@chromium.org

[leviw_travelin_and_unemployed, 2016-03-03 20:20:50]

The CQ bit was checked by leviw@chromium.org

[leviw_travelin_and_unemployed, 2016-03-03 20:20:51]

lgtm

[commit-bot: I haz the power, 2016-03-03 20:21:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1759173002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1759173002/1

[commit-bot: I haz the power, 2016-03-03 21:30:30]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-03 21:31:49]

Description was changed from

==========
[Layout API] Create api/LayoutLIItem and use it in html/HTMLLIElement

This adds LayoutLIItem as a descendant of LayoutBoxItem (there is
currently no LayoutBlockFlowItem) in the new layout API and provides
1 method, setNotInList(), which is used from HTMLLIElement::attach.

There are no functional changes.

BUG=499321
==========

to

==========
[Layout API] Create api/LayoutLIItem and use it in html/HTMLLIElement

This adds LayoutLIItem as a descendant of LayoutBoxItem (there is
currently no LayoutBlockFlowItem) in the new layout API and provides
1 method, setNotInList(), which is used from HTMLLIElement::attach.

There are no functional changes.

BUG=499321

Committed: https://crrev.com/1170487b35230f1e8dc2bcc3aad6aa5d266ca3f3
Cr-Commit-Position: refs/heads/master@{#379093}
==========

[commit-bot: I haz the power, 2016-03-03 21:31:51]

Patchset 1 (id:??) landed as
https://crrev.com/1170487b35230f1e8dc2bcc3aad6aa5d266ca3f3
Cr-Commit-Position: refs/heads/master@{#379093}