[Line Layout API] Add border*() to LineLayoutBoxModel

Source/core/layout/api/LineLayoutBoxModel.h

Index: Source/core/layout/api/LineLayoutBoxModel.h
diff --git a/Source/core/layout/api/LineLayoutBoxModel.h b/Source/core/layout/api/LineLayoutBoxModel.h
index a97d885b59e761efbf70e0fba004cdbac00d7549..be7bf1b4b5809a4552fac0bcd07924a398684ccb 100644
--- a/Source/core/layout/api/LineLayoutBoxModel.h
+++ b/Source/core/layout/api/LineLayoutBoxModel.h
@@ -108,6 +108,26 @@ public:
         return toBoxModel()->paddingAfter();
     }
 
+    int borderTop() const
+    {
+        return toBoxModel()->borderTop();
+    }
+
+    int borderBottom() const
+    {
+        return toBoxModel()->borderBottom();
+    }
+
+    int borderLeft() const
+    {
+        return toBoxModel()->borderLeft();
+    }
+
+    int borderRight() const
+    {
+        return toBoxModel()->borderRight();
+    }
+
     int borderBefore() const
     {
         return toBoxModel()->borderBefore();