Merge 3029: Remove floating objects from descendants of subtree roots

Merge 3029: Remove floating objects from descendants of subtree roots

The pre-layout for orthogonal flow clears floats from its containing
block in [1]. However, this can cause trouble for
markAllDescendantsWithFloatsForLayout() to mark descendants for layout.

When preceding floats overhanging to following blocks are gone, such
floats are referred from multiple following blocks including
descendants. Failure to mark descendants for layout may leave preceding
floats.

This patch ensures such floats are removed.

[1] https://codereview.chromium.org/2025543002

BUG=698455
Review-Url: https://codereview.chromium.org/2737253003
Cr-Commit-Position: refs/heads/master@{#456300}
(cherry picked from commit c020f6a22577978ce1fe89fc1a397f2a651c48a8)

Review-Url: https://codereview.chromium.org/2752193002 .
Cr-Commit-Position: refs/branch-heads/3029@{#230}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/285585b19c24f98a5b25d8536e5950c18db3a847

[kojii, 2017-03-16 07:00:34]

Description was changed from

==========
Merge 3029: Remove floating objects from descendants of subtree roots

The pre-layout for orthogonal flow clears floats from its containing
block in [1]. However, this can cause trouble for
markAllDescendantsWithFloatsForLayout() to mark descendants for layout.

When preceding floats overhanging to following blocks are gone, such
floats are referred from multiple following blocks including
descendants. Failure to mark descendants for layout may leave preceding
floats.

This patch ensures such floats are removed.

[1] https://codereview.chromium.org/2025543002

BUG=698455

Review-Url: https://codereview.chromium.org/2737253003
Cr-Commit-Position: refs/heads/master@{#456300}
(cherry picked from commit c020f6a22577978ce1fe89fc1a397f2a651c48a8)
==========

to

==========
Merge 3029: Remove floating objects from descendants of subtree roots

The pre-layout for orthogonal flow clears floats from its containing
block in [1]. However, this can cause trouble for
markAllDescendantsWithFloatsForLayout() to mark descendants for layout.

When preceding floats overhanging to following blocks are gone, such
floats are referred from multiple following blocks including
descendants. Failure to mark descendants for layout may leave preceding
floats.

This patch ensures such floats are removed.

[1] https://codereview.chromium.org/2025543002

BUG=698455

Review-Url: https://codereview.chromium.org/2737253003
Cr-Commit-Position: refs/heads/master@{#456300}
(cherry picked from commit c020f6a22577978ce1fe89fc1a397f2a651c48a8)

Review-Url: https://codereview.chromium.org/2752193002 .
Cr-Commit-Position: refs/branch-heads/3029@{#230}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/285585b19c24f98a5b25d8536e59...
==========

[kojii, 2017-03-16 07:00:37]

Committed patchset #1 (id:1) manually as
285585b19c24f98a5b25d8536e5950c18db3a847.