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

third_party/WebKit/Source/core/layout/LayoutState.cpp

Index: third_party/WebKit/Source/core/layout/LayoutState.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutState.cpp b/third_party/WebKit/Source/core/layout/LayoutState.cpp
index b00feb3c958cc61d62065d830f1180650c2f77ad..fc98857231e4c6b79e15e62f575eaa5db9ecec88 100644
--- a/third_party/WebKit/Source/core/layout/LayoutState.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutState.cpp
@@ -37,6 +37,7 @@ LayoutState::LayoutState(LayoutUnit pageLogicalHeight,
     : m_isPaginated(pageLogicalHeight),
       m_pageLogicalHeightChanged(pageLogicalHeightChanged),
       m_containingBlockLogicalWidthChanged(false),
+      m_paginationStateChanged(false),
       m_flowThread(nullptr),
       m_next(nullptr),
       m_pageLogicalHeight(pageLogicalHeight),
@@ -59,6 +60,7 @@ LayoutState::LayoutState(LayoutBox& layoutObject,
     m_flowThread = m_next->flowThread();
   else
     m_flowThread = nullptr;
+  m_paginationStateChanged = m_next->m_paginationStateChanged;
   layoutObject.view()->pushLayoutState(*this);
   bool fixed = layoutObject.isOutOfFlowPositioned() &&
                layoutObject.style()->position() == FixedPosition;
@@ -129,6 +131,7 @@ LayoutState::LayoutState(LayoutObject& root)
     : m_isPaginated(false),
       m_pageLogicalHeightChanged(false),
       m_containingBlockLogicalWidthChanged(false),
+      m_paginationStateChanged(false),
       m_flowThread(nullptr),
       m_next(root.view()->layoutState()),
       m_layoutObject(root) {