Stop appending fragmentainer groups when flow thread offset approaches infinity.

Stop appending fragmentainer groups when flow thread offset approaches infinity.

The final column height is a function of the difference between the logical
bottom and logical top of the flow thread portion of a given fragmentainer
group. If the logical top is LayoutUnit::max(), we know for sure that the
bottom won't be any larger than that. Just give up in such cases (and keep
using the current fragmentainer group), rather than ending up dividing by zero.

BUG=703543
Review-Url: https://codereview.chromium.org/2784493002
Cr-Commit-Position: refs/heads/master@{#460284}
Committed: https://chromium.googlesource.com/chromium/src/+/1ade7ad316d84cfceaf7980c4d14bd79aaea0ebc

[mstensho (USE GERRIT), 2017-03-28 14:39:14]

The CQ bit was checked by mstensho@opera.com to run a CQ dry run

[commit-bot: I haz the power, 2017-03-28 14:39:30]

Dry run: 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, 2017-03-28 16:31:43]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-03-28 16:31:44]

Dry run: This issue passed the CQ dry run.

[mstensho (USE GERRIT), 2017-03-28 21:01:20]

mstensho@opera.com changed reviewers:
+ eae@chromium.org

[eae, 2017-03-28 21:53:07]

LGTM

[mstensho (USE GERRIT), 2017-03-29 05:11:27]

The CQ bit was checked by mstensho@opera.com

[commit-bot: I haz the power, 2017-03-29 05:12:04]

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, 2017-03-29 05:16:38]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490764287785760, "parent_rev":
"18d53b4dbb62b07ff63391b11519ab4b8332a93b", "commit_rev":
"1ade7ad316d84cfceaf7980c4d14bd79aaea0ebc"}

[commit-bot: I haz the power, 2017-03-29 05:17:40]

Description was changed from

==========
Stop appending fragmentainer groups when flow thread offset approaches infinity.

The final column height is a function of the difference between the logical
bottom and logical top of the flow thread portion of a given fragmentainer
group. If the logical top is LayoutUnit::max(), we know for sure that the
bottom won't be any larger than that. Just give up in such cases (and keep
using the current fragmentainer group), rather than ending up dividing by zero.

BUG=703543
==========

to

==========
Stop appending fragmentainer groups when flow thread offset approaches infinity.

The final column height is a function of the difference between the logical
bottom and logical top of the flow thread portion of a given fragmentainer
group. If the logical top is LayoutUnit::max(), we know for sure that the
bottom won't be any larger than that. Just give up in such cases (and keep
using the current fragmentainer group), rather than ending up dividing by zero.

BUG=703543

Review-Url: https://codereview.chromium.org/2784493002
Cr-Commit-Position: refs/heads/master@{#460284}
Committed:
https://chromium.googlesource.com/chromium/src/+/1ade7ad316d84cfceaf7980c4d14...
==========

[commit-bot: I haz the power, 2017-03-29 05:17:41]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/1ade7ad316d84cfceaf7980c4d14...