Revert "Remove obsolete float-management code from line layout"

Source/core/layout/line/LineLayoutState.h

Index: Source/core/layout/line/LineLayoutState.h
diff --git a/Source/core/layout/line/LineLayoutState.h b/Source/core/layout/line/LineLayoutState.h
index 2724405ac74abc20adaa7d316ee4616648039bb8..e1d9d47a7b752e34696074f57eddac462ab402e7 100644
--- a/Source/core/layout/line/LineLayoutState.h
+++ b/Source/core/layout/line/LineLayoutState.h
@@ -39,6 +39,7 @@ public:
         , m_floatIndex(0)
         , m_endLineLogicalTop(0)
         , m_endLineMatched(false)
+        , m_checkForFloatsFromLastLine(false)
         , m_hasInlineChild(false)
         , m_isFullLayout(fullLayout)
         , m_containsBRWithClear(false)
@@ -70,6 +71,9 @@ public:
     bool endLineMatched() const { return m_endLineMatched; }
     void setEndLineMatched(bool endLineMatched) { m_endLineMatched = endLineMatched; }
 
+    bool checkForFloatsFromLastLine() const { return m_checkForFloatsFromLastLine; }
+    void setCheckForFloatsFromLastLine(bool check) { m_checkForFloatsFromLastLine = check; }
+
     bool hasInlineChild() const { return m_hasInlineChild; }
     void setHasInlineChild(bool hasInlineChild) { m_hasInlineChild = hasInlineChild; }
 
@@ -106,6 +110,7 @@ private:
     unsigned m_floatIndex;
     LayoutUnit m_endLineLogicalTop;
     bool m_endLineMatched;
+    bool m_checkForFloatsFromLastLine;
     // Used as a performance optimization to avoid doing a full paint invalidation when our floats
     // change but we don't have any inline children.
     bool m_hasInlineChild;