Need to examine the *bottom* of fragmented content.

Need to examine the *bottom* of fragmented content.

Content may cross fragmentainer boundaries, and when evaluating the need for
appending additional fragmentainer groups, we need to look at the bottom of the
content, not the top.

This CL is a prerequisite to fixing bug 552615, but note that it doesn't fix
anything there on its own.

BUG=552615
R=leviw@chromium.org

Committed: https://crrev.com/17107c91aefa150a7f1f9d6c572ba63091ec6126
Cr-Commit-Position: refs/heads/master@{#370323}

[mstensho (USE GERRIT), 2016-01-11 20:12:40]

Description was changed from

==========
Need to examine the *bottom* of fragmented content.

Content may cross fragmentainer boundaries, and when evaluating the need for
appending additional fragmentainer groups, we need to look at the bottom of the
content, not the top.

Since bottom coordinates in Blink are end-point exclusive,
columnSetAtBlockOffset() now needs to take a PageBoundaryRule parameter.
Expanded a unit test to cover that.

This CL is a prerequisite to fixing bug 552615, but note that it doesn't fix
anything there on its own.

BUG=552615
R=leviw@chromium.org
==========

to

==========
Need to examine the *bottom* of fragmented content.

Content may cross fragmentainer boundaries, and when evaluating the need for
appending additional fragmentainer groups, we need to look at the bottom of the
content, not the top.

This CL is a prerequisite to fixing bug 552615, but note that it doesn't fix
anything there on its own.

BUG=552615
R=leviw@chromium.org
==========

[leviw_travelin_and_unemployed, 2016-01-20 00:33:09]

The CQ bit was checked by leviw@chromium.org

[leviw_travelin_and_unemployed, 2016-01-20 00:33:10]

lgtm

[commit-bot: I haz the power, 2016-01-20 00:38:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1573133002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1573133002/20001

[commit-bot: I haz the power, 2016-01-20 05:24:30]

Description was changed from

==========
Need to examine the *bottom* of fragmented content.

Content may cross fragmentainer boundaries, and when evaluating the need for
appending additional fragmentainer groups, we need to look at the bottom of the
content, not the top.

This CL is a prerequisite to fixing bug 552615, but note that it doesn't fix
anything there on its own.

BUG=552615
R=leviw@chromium.org
==========

to

==========
Need to examine the *bottom* of fragmented content.

Content may cross fragmentainer boundaries, and when evaluating the need for
appending additional fragmentainer groups, we need to look at the bottom of the
content, not the top.

This CL is a prerequisite to fixing bug 552615, but note that it doesn't fix
anything there on its own.

BUG=552615
R=leviw@chromium.org
==========

[commit-bot: I haz the power, 2016-01-20 05:24:31]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-01-20 05:25:25]

Description was changed from

==========
Need to examine the *bottom* of fragmented content.

Content may cross fragmentainer boundaries, and when evaluating the need for
appending additional fragmentainer groups, we need to look at the bottom of the
content, not the top.

This CL is a prerequisite to fixing bug 552615, but note that it doesn't fix
anything there on its own.

BUG=552615
R=leviw@chromium.org
==========

to

==========
Need to examine the *bottom* of fragmented content.

Content may cross fragmentainer boundaries, and when evaluating the need for
appending additional fragmentainer groups, we need to look at the bottom of the
content, not the top.

This CL is a prerequisite to fixing bug 552615, but note that it doesn't fix
anything there on its own.

BUG=552615
R=leviw@chromium.org

Committed: https://crrev.com/17107c91aefa150a7f1f9d6c572ba63091ec6126
Cr-Commit-Position: refs/heads/master@{#370323}
==========

[commit-bot: I haz the power, 2016-01-20 05:25:26]

Patchset 2 (id:??) landed as
https://crrev.com/17107c91aefa150a7f1f9d6c572ba63091ec6126
Cr-Commit-Position: refs/heads/master@{#370323}