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

Source/core/layout/line/TrailingFloatsRootInlineBox.h

Index: Source/core/layout/line/TrailingFloatsRootInlineBox.h
diff --git a/Source/platform/fonts/TypesettingFeatures.h b/Source/core/layout/line/TrailingFloatsRootInlineBox.h
similarity index 75%
copy from Source/platform/fonts/TypesettingFeatures.h
copy to Source/core/layout/line/TrailingFloatsRootInlineBox.h
index 531391e10725c07e06d3809340b86198d0609a27..3722603d13aa48897dcd80f2724843012ea7d245 100644
--- a/Source/platform/fonts/TypesettingFeatures.h
+++ b/Source/core/layout/line/TrailingFloatsRootInlineBox.h
@@ -23,18 +23,25 @@
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef TypesettingFeatures_h
-#define TypesettingFeatures_h
+#ifndef TrailingFloatsRootInlineBox_h
+#define TrailingFloatsRootInlineBox_h
+
+#include "core/layout/line/RootInlineBox.h"
 
 namespace blink {
 
-enum TypesettingFeature {
-    Kerning = 1 << 0,
-    Ligatures = 1 << 1,
-};
+class TrailingFloatsRootInlineBox final : public RootInlineBox {
+public:
+    TrailingFloatsRootInlineBox(LayoutBlockFlow& block)
+        : RootInlineBox(block)
+    {
+        setHasVirtualLogicalHeight();
+    }
 
-typedef unsigned TypesettingFeatures;
+private:
+    virtual LayoutUnit virtualLogicalHeight() const override { return 0; }
+};
 
 } // namespace blink
 
-#endif // TypesettingFeatures_h
+#endif // TrailingFloatsRootInlineBox_h