Add inlineOverflow and blockOverflow methods to NGFragment.

third_party/WebKit/Source/core/layout/ng/NGFragment.cpp

 // Copyright 2016 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.
 
 #include "core/layout/ng/NGFragment.h"
 
 namespace blink {
 
-NGFragment::NGFragment(LayoutUnit inlineSize, LayoutUnit blockSize)
+NGFragment::NGFragment(LayoutUnit inlineSize, LayoutUnit blockSize,
+    LayoutUnit inlineOverflow, LayoutUnit blockOverflow)
     : m_inlineSize(inlineSize)
     , m_blockSize(blockSize)
+    , m_inlineOverflow(inlineOverflow)
+    , m_blockOverflow(blockOverflow)
 {
 }
 
 void NGFragment::setOffset(LayoutUnit inlineOffset, LayoutUnit blockOffset)
 {
     m_inlineOffset = inlineOffset;
     m_blockOffset = blockOffset;
 }
 
+DEFINE_TRACE(NGFragment)
+{
+    visitor->trace(m_children);
+}
+
 } // namespace blink