Handle stale m_owner in FrameView::needsScrollbarReconstruction.

Handle stale m_owner in FrameView::needsScrollbarReconstruction.

If iframe content is replaced by document.write, its LayoutScrollbar can hold a
reference to the previous body element.  FrameView now detects this situation
and reconstructs the scrollbar.

This mirrors similar code in PaintLayerScrollableArea added in r352644.

BUG=678821
Review-Url: https://codereview.chromium.org/2657743004
Cr-Commit-Position: refs/heads/master@{#446360}
Committed: https://chromium.googlesource.com/chromium/src/+/2b2839b3fba03dab76bee97c6aa4eb1ab1ecb836

[skobes, 2017-01-26 01:11:02]

Description was changed from

==========
Handle stale owner in FrameView::needsScrollbarReconstruction.

If iframe content is replaced by document.write, its LayoutScrollbar can hold a
reference to the previous body element.  FrameView now detects this situation
and reconstructs the scrollbar.

This mirrors similar code in PaintLayerScrollableArea added in r352644.

BUG=678821
==========

to

==========
Handle stale m_owner in FrameView::needsScrollbarReconstruction.

If iframe content is replaced by document.write, its LayoutScrollbar can hold a
reference to the previous body element.  FrameView now detects this situation
and reconstructs the scrollbar.

This mirrors similar code in PaintLayerScrollableArea added in r352644.

BUG=678821
==========

[skobes, 2017-01-26 01:11:11]

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

[commit-bot: I haz the power, 2017-01-26 01:11:55]

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

[skobes, 2017-01-26 02:44:23]

skobes@chromium.org changed reviewers:
+ szager@chromium.org

[commit-bot: I haz the power, 2017-01-26 02:57:51]

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

[commit-bot: I haz the power, 2017-01-26 02:57:52]

Dry run: This issue passed the CQ dry run.

[szager1, 2017-01-26 05:56:47]

lgtm

[skobes, 2017-01-26 15:09:53]

The CQ bit was checked by skobes@chromium.org

[skobes, 2017-01-26 15:09:53]

The patchset sent to the CQ was uploaded after l-g-t-m from szager@chromium.org
Link to the patchset: https://codereview.chromium.org/2657743004/#ps40001
(title: "rebase")

[commit-bot: I haz the power, 2017-01-26 15:10:02]

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, 2017-01-26 17:27:51]

CQ is committing da patch.

Bot data: {"patchset_id": 40001, "attempt_start_ts": 1485443393560170,
"parent_rev": "6cbafbc8215e53a5e8689b46c58ef58ea0bc6ae4", "commit_rev":
"2b2839b3fba03dab76bee97c6aa4eb1ab1ecb836"}

[commit-bot: I haz the power, 2017-01-26 17:28:28]

Description was changed from

==========
Handle stale m_owner in FrameView::needsScrollbarReconstruction.

If iframe content is replaced by document.write, its LayoutScrollbar can hold a
reference to the previous body element.  FrameView now detects this situation
and reconstructs the scrollbar.

This mirrors similar code in PaintLayerScrollableArea added in r352644.

BUG=678821
==========

to

==========
Handle stale m_owner in FrameView::needsScrollbarReconstruction.

If iframe content is replaced by document.write, its LayoutScrollbar can hold a
reference to the previous body element.  FrameView now detects this situation
and reconstructs the scrollbar.

This mirrors similar code in PaintLayerScrollableArea added in r352644.

BUG=678821

Review-Url: https://codereview.chromium.org/2657743004
Cr-Commit-Position: refs/heads/master@{#446360}
Committed:
https://chromium.googlesource.com/chromium/src/+/2b2839b3fba03dab76bee97c6aa4...
==========

[commit-bot: I haz the power, 2017-01-26 17:28:30]

Committed patchset #3 (id:40001) as
https://chromium.googlesource.com/chromium/src/+/2b2839b3fba03dab76bee97c6aa4...