Don't allow scripts to run when a node is being adopted.

Don't allow scripts to run when a node is being adopted.

Running a script in the middle of rescoping nodes can break a lot of invariants and leave DOM in an inconsistent state.

This patch adds a ScriptForbiddenScope in TreeScope::adoptIfNeeded to ensure it never happens.

BUG=605766
Review URL: https://codereview.chromium.org/1910403003

Cr-Commit-Position: refs/heads/master@{#389425}
(cherry picked from commit 146ff1bb11c88778d466bd7a49b544f2b5806ee0)

TBR=dominicc@chromium.org,esprehn@chromium.org

Committed: https://chromium.googlesource.com/chromium/src/+/73dd06077821b2beba42165c484913601d9e8643

[Martin Barbella, 2016-05-06 19:35:15]

Description was changed from

==========
Don't allow scripts to run when a node is being adopted.

Running a script in the middle of rescoping nodes can break a lot of invariants
and leave DOM in an inconsistent state.

This patch adds a ScriptForbiddenScope in TreeScope::adoptIfNeeded to ensure it
never happens.

BUG=605766

Review URL: https://codereview.chromium.org/1910403003

Cr-Commit-Position: refs/heads/master@{#389425}
(cherry picked from commit 146ff1bb11c88778d466bd7a49b544f2b5806ee0)

TBR=dominicc@chromium.org,esprehn@chromium.org
==========

to

==========
Don't allow scripts to run when a node is being adopted.

Running a script in the middle of rescoping nodes can break a lot of invariants
and leave DOM in an inconsistent state.

This patch adds a ScriptForbiddenScope in TreeScope::adoptIfNeeded to ensure it
never happens.

BUG=605766

Review URL: https://codereview.chromium.org/1910403003

Cr-Commit-Position: refs/heads/master@{#389425}
(cherry picked from commit 146ff1bb11c88778d466bd7a49b544f2b5806ee0)

TBR=dominicc@chromium.org,esprehn@chromium.org

Committed:
https://chromium.googlesource.com/chromium/src/+/73dd06077821b2beba42165c4849...
==========

[Martin Barbella, 2016-05-06 19:35:17]

Committed patchset #1 (id:1) manually as
73dd06077821b2beba42165c484913601d9e8643.

[dominicc (has gone to gerrit), 2016-05-07 15:27:43]

lgtm