Update containing block's positioned descendants list when an object becomes out-of-flow-positioned

Update containing block's positioned descendants list when an object becomes out-of-flow-positioned

This is required when there are descendants needing overflow recalc.
Otherwise during overflow recalc because the containing block's
positioned descendant list didn't contain the new out-of-flow-positioned
object we would not reach the descendants needing overflow recalc.

BUG=623867
TEST=fast/overflow/add-visual-overflow-and-change-container-position.html

Review-Url: https://codereview.chromium.org/2103843003
Cr-Commit-Position: refs/heads/master@{#402550}
Committed: https://chromium.googlesource.com/chromium/src/+/ea9c8c0ffffe09bb297ed9c5c619f411e06f7250

[Xianzhu, 2016-06-29 20:56:02]

Description was changed from

==========
Update containing block's positioned descendants list when an object becomes
out-of-flow-positioned

This is required when there are descendants needing overflow recalc.
Otherwise during overflow recalc because the containing block's
positioned descendant list didn't contain the new out-of-flow-positioned
object we would not reach the descendants needing overflow recalc.

BUG=623867
TEST=fast/overflow/add-visual-overflow-and-change-container-position.html

Review-Url: https://codereview.chromium.org/2103843003
Cr-Commit-Position: refs/heads/master@{#402550}
==========

to

==========
Update containing block's positioned descendants list when an object becomes
out-of-flow-positioned

This is required when there are descendants needing overflow recalc.
Otherwise during overflow recalc because the containing block's
positioned descendant list didn't contain the new out-of-flow-positioned
object we would not reach the descendants needing overflow recalc.

BUG=623867
TEST=fast/overflow/add-visual-overflow-and-change-container-position.html

Review-Url: https://codereview.chromium.org/2103843003
Cr-Commit-Position: refs/heads/master@{#402550}
Committed:
https://chromium.googlesource.com/chromium/src/+/ea9c8c0ffffe09bb297ed9c5c619...
==========

[Xianzhu, 2016-06-29 20:56:04]

Committed patchset #1 (id:1) manually as
ea9c8c0ffffe09bb297ed9c5c619f411e06f7250.

[Charlie Reis, 2016-06-29 22:29:50]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2109263002/ by creis@chromium.org.

The reason for reverting is: Caused a compile error in the M52 build.  See
https://crbug.com/624571 for details..