[LayoutNG] Add NGFragment class definition.

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

+// 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.
+
+#ifndef NGFragment_h
+#define NGFragment_h
+
+#include "core/CoreExport.h"
+#include "platform/LayoutUnit.h"
+
+namespace blink {
+
+class CORE_EXPORT NGFragment final {
+public:
+    NGFragment(LayoutUnit inlineSize, LayoutUnit blockSize);
+    ~NGFragment() { }
+
+    LayoutUnit inlineSize() const { return m_inlineSize; }
+    LayoutUnit blockSize() const { return m_blockSize; }
+
+    LayoutUnit inlineOffset() const { return m_inlineOffset; }
+    LayoutUnit blockOffset() const { return m_blockOffset; }
+
+    void setOffset(LayoutUnit inlineOffset, LayoutUnit blockOffset);
+
+private:
+    LayoutUnit m_inlineSize;
+    LayoutUnit m_blockSize;
+
+    LayoutUnit m_inlineOffset;
+    LayoutUnit m_blockOffset;
+};
+
+} // namespace blink
+
+#endif // NGFragment_h