[Layout API] Add LocalFrame::contentLayoutItem and use in VisualViewport

[Layout API] Add LocalFrame::contentLayoutItem and use in VisualViewport

LocalFrame has a public contentLayoutObject() method that returns a
LayoutView*. This needs to go away eventually. To ease migration, I've
added a contentLayoutItem() method next to it that returns a
LayoutViewItem. I fixed once reference in VisualViewport to call
contentLayoutItem() instead of contentLayoutObject() (to access a method
that already exists in LayoutViewItem, so no new API methods required).
I also simplified some code in FrameView that had been working around
the fact that LocalFrame didn't offer a method that returned a
LayoutViewItem.

There are no functional changes.

BUG=499321
Committed: https://crrev.com/1ed9a4dfd34de7d19c6eb8d0bc20dac44f7d355e
Cr-Commit-Position: refs/heads/master@{#383783}

[pilgrim_google, 2016-03-29 14:30:14]

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

[leviw_travelin_and_unemployed, 2016-03-29 18:47:07]

The CQ bit was checked by leviw@chromium.org

[leviw_travelin_and_unemployed, 2016-03-29 18:47:08]

lgtm

[commit-bot: I haz the power, 2016-03-29 18:47:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1843603002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1843603002/1

[commit-bot: I haz the power, 2016-03-29 18:52:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-29 18:53:29]

Description was changed from

==========
[Layout API] Add LocalFrame::contentLayoutItem and use in VisualViewport

LocalFrame has a public contentLayoutObject() method that returns a
LayoutView*. This needs to go away eventually. To ease migration, I've
added a contentLayoutItem() method next to it that returns a
LayoutViewItem. I fixed once reference in VisualViewport to call
contentLayoutItem() instead of contentLayoutObject() (to access a method
that already exists in LayoutViewItem, so no new API methods required).
I also simplified some code in FrameView that had been working around
the fact that LocalFrame didn't offer a method that returned a
LayoutViewItem.

There are no functional changes.

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

to

==========
[Layout API] Add LocalFrame::contentLayoutItem and use in VisualViewport

LocalFrame has a public contentLayoutObject() method that returns a
LayoutView*. This needs to go away eventually. To ease migration, I've
added a contentLayoutItem() method next to it that returns a
LayoutViewItem. I fixed once reference in VisualViewport to call
contentLayoutItem() instead of contentLayoutObject() (to access a method
that already exists in LayoutViewItem, so no new API methods required).
I also simplified some code in FrameView that had been working around
the fact that LocalFrame didn't offer a method that returned a
LayoutViewItem.

There are no functional changes.

BUG=499321

Committed: https://crrev.com/1ed9a4dfd34de7d19c6eb8d0bc20dac44f7d355e
Cr-Commit-Position: refs/heads/master@{#383783}
==========

[commit-bot: I haz the power, 2016-03-29 18:53:30]

Patchset 1 (id:??) landed as
https://crrev.com/1ed9a4dfd34de7d19c6eb8d0bc20dac44f7d355e
Cr-Commit-Position: refs/heads/master@{#383783}