Flowthread should move its floatlists to container when evacuating

Flowthread should move its floatlists to container when evacuating

This ensures that if any of the floats gets deleted the new
container will be able to delete from its new descendants'
float-lists.

BUG=714440
Review-Url: https://codereview.chromium.org/2863093004
Cr-Commit-Position: refs/heads/master@{#470128}
(cherry picked from commit a925ec8c709dcc3768dfeb349bf19c766d6f5c7d)

Review-Url: https://codereview.chromium.org/2876943002 .
Cr-Commit-Position: refs/branch-heads/3071@{#519}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/37b22ee298b3cde4c44ffc5ab83449c26b0dfe59

[rhogan, 2017-05-11 21:55:41]

Description was changed from

==========
Flowthread should move its floatlists to container when evacuating

This ensures that if any of the floats gets deleted the new
container will be able to delete from its new descendants'
float-lists.

BUG=714440

Review-Url: https://codereview.chromium.org/2863093004
Cr-Commit-Position: refs/heads/master@{#470128}
(cherry picked from commit a925ec8c709dcc3768dfeb349bf19c766d6f5c7d)
==========

to

==========
Flowthread should move its floatlists to container when evacuating

This ensures that if any of the floats gets deleted the new
container will be able to delete from its new descendants'
float-lists.

BUG=714440

Review-Url: https://codereview.chromium.org/2863093004
Cr-Commit-Position: refs/heads/master@{#470128}
(cherry picked from commit a925ec8c709dcc3768dfeb349bf19c766d6f5c7d)

Review-Url: https://codereview.chromium.org/2876943002 .
Cr-Commit-Position: refs/branch-heads/3071@{#519}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/37b22ee298b3cde4c44ffc5ab834...
==========

[rhogan, 2017-05-11 21:55:43]

Committed patchset #1 (id:1) manually as
37b22ee298b3cde4c44ffc5ab83449c26b0dfe59.