[LayoutNG] Add base class for NGFragment and NGText

third_party/WebKit/Source/core/layout/ng/ng_fragment.cc

 // 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/ng_fragment.h"
 
-namespace blink {
-
-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
+namespace blink {}  // namespace blink