Return null SelectionPaintRange if no LayoutObject.

Return null SelectionPaintRange if no LayoutObject.

There is a case that CreateVisiblePosition returns {start, null} range
 in LayoutSelection::CalcSelection.
VisibleSelection and EphemeralRange constructors prohibit such case
 but it is by DCHECK so we need cover on Release build failure.

BUG=739996
Review-Url: https://codereview.chromium.org/2968363002
Cr-Commit-Position: refs/heads/master@{#485184}
Committed: https://chromium.googlesource.com/chromium/src/+/b1601a7ae547960927ebc20de9776dc0c2e779e3

[yoichio, 2017-07-07 07:19:47]

The CQ bit was checked by yoichio@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-07-07 07:19:59]

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, 2017-07-07 07:59:46]

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

[commit-bot: I haz the power, 2017-07-07 07:59:47]

Dry run: Try jobs failed on following builders:
  win_chromium_compile_dbg_ng on master.tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_comp...)

[yoichio, 2017-07-07 08:11:43]

The CQ bit was checked by yoichio@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-07-07 08:11:57]

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, 2017-07-07 09:34:29]

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

[commit-bot: I haz the power, 2017-07-07 09:34:30]

Dry run: This issue passed the CQ dry run.

[yoichio, 2017-07-10 01:46:01]

Description was changed from

==========
Return null SelectionPaintRange if no LayoutObject.

BUG=739996
==========

to

==========
Return null SelectionPaintRange if no LayoutObject.

There is a case that CreateVisiblePosition returns {start, null} range
 in LayoutSelection::CalcSelection.
VisibleSelection and EphemeralRange constructors prohibit such case
 but it is by DCHECK so we need cover on Release build failure.

BUG=739996
==========

[yoichio, 2017-07-10 01:46:01]

yoichio@chromium.org changed reviewers:
+ yosin@chromium.org

[yosin_UTC9, 2017-07-10 03:01:22]

The CQ bit was checked by yosin@chromium.org

[yosin_UTC9, 2017-07-10 03:01:23]

lgtm

[commit-bot: I haz the power, 2017-07-10 03:01:36]

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, 2017-07-10 04:44:44]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1499655682857610, "parent_rev":
"8a22a574d88c8a87f4854b8306dff5d4d776f94a", "commit_rev":
"b1601a7ae547960927ebc20de9776dc0c2e779e3"}

[commit-bot: I haz the power, 2017-07-10 04:45:09]

Description was changed from

==========
Return null SelectionPaintRange if no LayoutObject.

There is a case that CreateVisiblePosition returns {start, null} range
 in LayoutSelection::CalcSelection.
VisibleSelection and EphemeralRange constructors prohibit such case
 but it is by DCHECK so we need cover on Release build failure.

BUG=739996
==========

to

==========
Return null SelectionPaintRange if no LayoutObject.

There is a case that CreateVisiblePosition returns {start, null} range
 in LayoutSelection::CalcSelection.
VisibleSelection and EphemeralRange constructors prohibit such case
 but it is by DCHECK so we need cover on Release build failure.

BUG=739996

Review-Url: https://codereview.chromium.org/2968363002
Cr-Commit-Position: refs/heads/master@{#485184}
Committed:
https://chromium.googlesource.com/chromium/src/+/b1601a7ae547960927ebc20de977...
==========

[commit-bot: I haz the power, 2017-07-10 04:45:11]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/b1601a7ae547960927ebc20de977...