Make Range::createAdjustedToTreeScope() to handle the shadow root at end of document tree correctly

Make Range::createAdjustedToTreeScope() to handle the shadow root at end of document tree correctly.

This patch makes |Range::createAdjustedToTreeScope()| to handle the shadow root
at end of document tree correctly.

Before this patch |createAdjustedToTreeScope()| to return the |Range| object
in shadow tree rather than document tree, since it attempts to check tree
scope of null-Node which is computed from collapsed |Range| object of the
position after shadow root.

This patch uses tree scope of anchor node of specified position instead of
first node in range, which is |nullptr| if there is no node after specified
position, e.g. |BeforeChildren| of the last node without child nodes,
|AfterAnchor| or |AfterChildren| of the last node. The tree scope of position
can be determined by anchor node rather than first node in the range because
tree scope of child nodes of anchor node is same as anchor node, tree scope of
before and after anchor node is also same as anchor node since parent of anchor
node and anchor node are in same tree scope.

BUG=666246
TEST=run_webkit_unit_tests --gtest_filter=RangeTest.createAdjustedToTreeScopeWithPositionInShadowTree

Committed: https://crrev.com/794ce12c31a9d697aaca28e24078c5d9f6edfe59
Cr-Commit-Position: refs/heads/master@{#433851}

[yosin_UTC9, 2016-11-22 07:31:03]

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

[commit-bot: I haz the power, 2016-11-22 07:31:20]

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, 2016-11-22 07:44:45]

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

[commit-bot: I haz the power, 2016-11-22 07:44:45]

Dry run: Try jobs failed on following builders:
  linux_chromium_chromeos_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  linux_chromium_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[yosin_UTC9, 2016-11-22 08:40:03]

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

[yosin_UTC9, 2016-11-22 08:40:18]

Patchset #1 (id:1) has been deleted

[commit-bot: I haz the power, 2016-11-22 08:40:20]

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

[yosin_UTC9, 2016-11-22 08:51:39]

Description was changed from

==========
2016-11-22T16:24:16

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

to

==========
Make Range::createAdjustedToTreeScope() to handle the shadow root at end of
document tree correctly.

This patch makes |Range::createAdjustedToTreeScope()| to handle the shadow root
at end of document tree correctly.

Before this patch |createAdjustedToTreeScope()| to return the |Range| object
in shadow tree rather than document tree, since it attempts to check tree
scope of null-Node which is computed from collapsed |Range| object of the
position after shadow root.

This patch uses tree scope of anchor node of specified position instead of
first node in range, which is |nullptr| if there is no node after specified
position, e.g. |BeforeChildren| of the last node without child nodes,
|AfterAnchor| or |AfterChildren| of the last node. The tree scope of position
can be determined by anchor node rather than first node in the range because
tree scope of child nodes of anchor node is same as anchor node, tree scope of
before and after anchor node is also same as anchor node since parent of anchor
node and anchor node are in same tree scope.

BUG=666246
TEST=run_webkit_unit_tests
--gtest_filter=RangeTest.createAdjustedToTreeScopeWithPositionInShadowTree
==========

[yosin_UTC9, 2016-11-22 09:41:00]

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

[yosin_UTC9, 2016-11-22 09:41:01]

PTAL

[tkent, 2016-11-22 09:49:04]

lgtm

[commit-bot: I haz the power, 2016-11-22 10:12:35]

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

[commit-bot: I haz the power, 2016-11-22 10:12:36]

Dry run: This issue passed the CQ dry run.

[yosin_UTC9, 2016-11-22 14:01:39]

The CQ bit was checked by yosin@chromium.org

[commit-bot: I haz the power, 2016-11-22 14:02:09]

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, 2016-11-22 14:06:22]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1479823299811830,
"parent_rev": "bbe060211695f0b1245add0dab8f6dd0fa4403f3", "commit_rev":
"a57f22324d689b2588cea113b1dabf5e9e906fd7"}

[commit-bot: I haz the power, 2016-11-22 14:06:52]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2016-11-22 14:10:39]

Description was changed from

==========
Make Range::createAdjustedToTreeScope() to handle the shadow root at end of
document tree correctly.

This patch makes |Range::createAdjustedToTreeScope()| to handle the shadow root
at end of document tree correctly.

Before this patch |createAdjustedToTreeScope()| to return the |Range| object
in shadow tree rather than document tree, since it attempts to check tree
scope of null-Node which is computed from collapsed |Range| object of the
position after shadow root.

This patch uses tree scope of anchor node of specified position instead of
first node in range, which is |nullptr| if there is no node after specified
position, e.g. |BeforeChildren| of the last node without child nodes,
|AfterAnchor| or |AfterChildren| of the last node. The tree scope of position
can be determined by anchor node rather than first node in the range because
tree scope of child nodes of anchor node is same as anchor node, tree scope of
before and after anchor node is also same as anchor node since parent of anchor
node and anchor node are in same tree scope.

BUG=666246
TEST=run_webkit_unit_tests
--gtest_filter=RangeTest.createAdjustedToTreeScopeWithPositionInShadowTree
==========

to

==========
Make Range::createAdjustedToTreeScope() to handle the shadow root at end of
document tree correctly.

This patch makes |Range::createAdjustedToTreeScope()| to handle the shadow root
at end of document tree correctly.

Before this patch |createAdjustedToTreeScope()| to return the |Range| object
in shadow tree rather than document tree, since it attempts to check tree
scope of null-Node which is computed from collapsed |Range| object of the
position after shadow root.

This patch uses tree scope of anchor node of specified position instead of
first node in range, which is |nullptr| if there is no node after specified
position, e.g. |BeforeChildren| of the last node without child nodes,
|AfterAnchor| or |AfterChildren| of the last node. The tree scope of position
can be determined by anchor node rather than first node in the range because
tree scope of child nodes of anchor node is same as anchor node, tree scope of
before and after anchor node is also same as anchor node since parent of anchor
node and anchor node are in same tree scope.

BUG=666246
TEST=run_webkit_unit_tests
--gtest_filter=RangeTest.createAdjustedToTreeScopeWithPositionInShadowTree

Committed: https://crrev.com/794ce12c31a9d697aaca28e24078c5d9f6edfe59
Cr-Commit-Position: refs/heads/master@{#433851}
==========

[commit-bot: I haz the power, 2016-11-22 14:10:40]

Patchset 1 (id:??) landed as
https://crrev.com/794ce12c31a9d697aaca28e24078c5d9f6edfe59
Cr-Commit-Position: refs/heads/master@{#433851}