[Line Layout API] Convert most of InlineBoxPainter to new API

Source/core/layout/api/LineLayoutItem.h

Index: Source/core/layout/api/LineLayoutItem.h
diff --git a/Source/core/layout/api/LineLayoutItem.h b/Source/core/layout/api/LineLayoutItem.h
index e443ab316aeba3e7b8c576d06aa466b15060a3d0..68771eecb0ee19641320a26212476cdaba8785ab 100644
--- a/Source/core/layout/api/LineLayoutItem.h
+++ b/Source/core/layout/api/LineLayoutItem.h
@@ -18,6 +18,7 @@ class HitTestRequest;
 class HitTestLocation;
 class LayoutObject;
 class LineLayoutBox;
+class LineLayoutBoxModel;
 
 enum HitTestFilter;
 
@@ -61,10 +62,15 @@ public:
     }
 
     // Implemented in LineLayoutBox.h
-    // Intentionally returns a Box instead of a Block to avoid exposing LayoutBlock
+    // Intentionally returns a LineLayoutBox to avoid exposing LayoutBlock
     // to the line layout code.
     LineLayoutBox containingBlock() const;
 
+    // Implemented in LineLayoutBoxModel.h
+    // Intentionally returns a LineLayoutBoxModel to avoid exposing LayoutBoxModelObject
+    // to the line layout code.
+    LineLayoutBoxModel enclosingBoxModelObject() const;
+
     LineLayoutItem container() const
     {
         return LineLayoutItem(m_layoutObject->container());