Make toPositionInFlatTree() to handle a position anchored by shadow root

Make toPositionInFlatTree() to handle a position anchored by shadow root

This patch changes |toPositionInFlatTree()| to handle a position anchored by
shadow root with position anchor type other than |OffsetInAnchor|.

This patch is a preparation of http://crrev.com/2221783003, which attempt to
call |toPositionInFlatTree()| with a position which uses |ShadowRoot| as
anchor node.

BUG=139552, 632333
TEST=run_webkit_unit_tests --gtest_filter=PositionTest.ToPositionInFlatTreeWithShadowRoot

Committed: https://crrev.com/a6d7af3689ae51f9c41b68c500150a1648d20241
Cr-Commit-Position: refs/heads/master@{#410646}

[yosin_UTC9, 2016-08-09 05:04:53]

Description was changed from

==========
2016-08-09T14:04:01

BUG=
==========

to

==========
Make toPositionInFlatTree() to handle a position anchored by shadow root

This patch changes |toPositionInFlatTree()| to handle a position anchored by
shadow root with position anchor type other than |OffsetInAnchor|.

This patch is a preparation of http://crrev.com/2221783003, which attempt to
call |toPositionInFlatTree()| with a position which uses |ShadowRoot| as
anchor node.

BUG=139552, 632333
TEST=run_webkit_unit_tests
--gtest_filter=PositionTest.ToPositionInFlatTreeWithShadowRoot
==========

[yosin_UTC9, 2016-08-09 05:04:58]

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

[commit-bot: I haz the power, 2016-08-09 05:05:32]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[yosin_UTC9, 2016-08-09 07:19:22]

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

[yosin_UTC9, 2016-08-09 07:19:23]

PTAL

[Xiaocheng, 2016-08-09 08:19:27]

lgtm

[commit-bot: I haz the power, 2016-08-09 08:39:18]

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

[commit-bot: I haz the power, 2016-08-09 08:39:19]

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

[yosin_UTC9, 2016-08-09 09:30:30]

The CQ bit was checked by yosin@chromium.org

[yosin_UTC9, 2016-08-09 09:31:04]

The CQ bit was unchecked by yosin@chromium.org

[commit-bot: I haz the power, 2016-08-09 09:31:09]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[yosin_UTC9, 2016-08-09 09:31:16]

The CQ bit was checked by yosin@chromium.org

[commit-bot: I haz the power, 2016-08-09 09:31:57]

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, 2016-08-09 13:03:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-09 13:04:56]

Description was changed from

==========
Make toPositionInFlatTree() to handle a position anchored by shadow root

This patch changes |toPositionInFlatTree()| to handle a position anchored by
shadow root with position anchor type other than |OffsetInAnchor|.

This patch is a preparation of http://crrev.com/2221783003, which attempt to
call |toPositionInFlatTree()| with a position which uses |ShadowRoot| as
anchor node.

BUG=139552, 632333
TEST=run_webkit_unit_tests
--gtest_filter=PositionTest.ToPositionInFlatTreeWithShadowRoot
==========

to

==========
Make toPositionInFlatTree() to handle a position anchored by shadow root

This patch changes |toPositionInFlatTree()| to handle a position anchored by
shadow root with position anchor type other than |OffsetInAnchor|.

This patch is a preparation of http://crrev.com/2221783003, which attempt to
call |toPositionInFlatTree()| with a position which uses |ShadowRoot| as
anchor node.

BUG=139552, 632333
TEST=run_webkit_unit_tests
--gtest_filter=PositionTest.ToPositionInFlatTreeWithShadowRoot

Committed: https://crrev.com/a6d7af3689ae51f9c41b68c500150a1648d20241
Cr-Commit-Position: refs/heads/master@{#410646}
==========

[commit-bot: I haz the power, 2016-08-09 13:04:58]

Patchset 1 (id:??) landed as
https://crrev.com/a6d7af3689ae51f9c41b68c500150a1648d20241
Cr-Commit-Position: refs/heads/master@{#410646}