The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2cfe39f5654c3284b904f4e4e6ae5b08b6a4b5a7

commit 2cfe39f5654c3284b904f4e4e6ae5b08b6a4b5a7
Author: mstensho <mstensho@opera.com>
Date: Thu Oct 27 17:09:41 2016

Need a deep layout pass when becoming (un)fragmented.

When an object ceases to be fragmented (e.g. when leaving print preview), there
may be pagination struts that need to be removed. Therefore, we need to lay out
all descendants of a block that ceased to establish a fragmentation context.

Similarly, when becoming fragmented (e.g. when entering print preview), we need
to go through every descendant. There may both be implicit and forced breaks to
insert.

BUG= 658019 

Review-Url: https://codereview.chromium.org/2454083002
Cr-Commit-Position: refs/heads/master@{#428062}

[add] https://crrev.com/2cfe39f5654c3284b904f4e4e6ae5b08b6a4b5a7/third_party/WebKit/LayoutTests/fragmentation/become-unfragmented-with-unbreakable-blocks.html
[modify] https://crrev.com/2cfe39f5654c3284b904f4e4e6ae5b08b6a4b5a7/third_party/WebKit/Source/core/layout/LayoutBlock.cpp
[modify] https://crrev.com/2cfe39f5654c3284b904f4e4e6ae5b08b6a4b5a7/third_party/WebKit/Source/core/layout/LayoutBlock.h
[modify] https://crrev.com/2cfe39f5654c3284b904f4e4e6ae5b08b6a4b5a7/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
[modify] https://crrev.com/2cfe39f5654c3284b904f4e4e6ae5b08b6a4b5a7/third_party/WebKit/Source/core/layout/LayoutBox.cpp
[modify] https://crrev.com/2cfe39f5654c3284b904f4e4e6ae5b08b6a4b5a7/third_party/WebKit/Source/core/layout/LayoutState.cpp
[modify] https://crrev.com/2cfe39f5654c3284b904f4e4e6ae5b08b6a4b5a7/third_party/WebKit/Source/core/layout/LayoutState.h
[modify] https://crrev.com/2cfe39f5654c3284b904f4e4e6ae5b08b6a4b5a7/third_party/WebKit/Source/core/layout/LayoutView.cpp

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e2a5a72d7a8ac8bb8016c7dbe9021849c6ca04b8

commit e2a5a72d7a8ac8bb8016c7dbe9021849c6ca04b8
Author: mstensho <mstensho@opera.com>
Date: Thu Oct 27 22:16:07 2016

Need to remove line pagination struts when no longer fragmented.

We only used to recalculate pagination struts on lines when we were inside a
fragmentation context, but if said fragmentation context ceases to be one, we
need one final strut recalculation pass, to get rid of them all.

BUG= 658019 

Review-Url: https://codereview.chromium.org/2460673002
Cr-Commit-Position: refs/heads/master@{#428161}

[add] https://crrev.com/e2a5a72d7a8ac8bb8016c7dbe9021849c6ca04b8/third_party/WebKit/LayoutTests/fragmentation/become-unfragmented-with-lines.html
[modify] https://crrev.com/e2a5a72d7a8ac8bb8016c7dbe9021849c6ca04b8/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
[modify] https://crrev.com/e2a5a72d7a8ac8bb8016c7dbe9021849c6ca04b8/third_party/WebKit/Source/core/layout/LayoutBlockFlowLine.cpp
[modify] https://crrev.com/e2a5a72d7a8ac8bb8016c7dbe9021849c6ca04b8/third_party/WebKit/Source/core/layout/line/LineLayoutState.h

 Issue 517043  has been merged into this issue.