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

Source/core/layout/api/LineLayoutBoxModel.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef LineLayoutBoxModel_h
 #define LineLayoutBoxModel_h
 
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/layout/api/LineLayoutItem.h"
 #include "platform/LayoutUnit.h"
@@ skipping 90 matching lines @@
     LayoutUnit paddingBefore() const
     {
         return toBoxModel()->paddingBefore();
     }
 
     LayoutUnit paddingAfter() const
     {
         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();
     }
 
     int borderAfter() const
     {
         return toBoxModel()->borderAfter();
     }
 
@@ skipping 23 matching lines @@
 };
 
 inline LineLayoutBoxModel LineLayoutItem::enclosingBoxModelObject() const
 {
     return LineLayoutBoxModel(layoutObject()->enclosingBoxModelObject());
 }
 
 } // namespace blink
 
 #endif // LineLayoutBoxModel_h