[LayoutNG] Add base class for NGFragment and NGText

third_party/WebKit/Source/core/layout/ng/ng_fragment_base.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_base.h"
+#include "core/layout/ng/ng_fragment.h"
+#include "core/layout/ng/ng_text.h"
+
+namespace blink {
+
+NGFragmentBase::NGFragmentBase(LayoutUnit inlineSize,
+                               LayoutUnit blockSize,
+                               LayoutUnit inlineOverflow,
+                               LayoutUnit blockOverflow)
+    : m_inlineSize(inlineSize),
+      m_blockSize(blockSize),
+      m_inlineOverflow(inlineOverflow),
+      m_blockOverflow(blockOverflow) {}
+
+void NGFragmentBase::setOffset(LayoutUnit inlineOffset,
+                               LayoutUnit blockOffset) {
+  m_inlineOffset = inlineOffset;
+  m_blockOffset = blockOffset;
+}
+
+DEFINE_TRACE(NGFragmentBase) {
+  if (m_isText)
+    static_cast<NGText*>(this)->traceAfterDispatch(visitor);
+  else
+    static_cast<NGFragment*>(this)->traceAfterDispatch(visitor);
+}
+
+}  // namespace blink