[LayoutNG] Change core/layout/ng to Chromium style and rename files.

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"
-#include "platform/heap/Handle.h"
-#include "wtf/Vector.h"
-
-namespace blink {
-
-class CORE_EXPORT NGFragment final : public GarbageCollected<NGFragment> {
-public:
-    NGFragment(LayoutUnit inlineSize, LayoutUnit blockSize,
-        LayoutUnit inlineOverflow, LayoutUnit blockOverflow);
-
-    // Returns the border-box size.
-    LayoutUnit inlineSize() const { return m_inlineSize; }
-    LayoutUnit blockSize() const { return m_blockSize; }
-
-    // Returns the total size, including the contents outside of the border-box.
-    LayoutUnit inlineOverflow() const { return m_inlineOverflow; }
-    LayoutUnit blockOverflow() const { return m_blockOverflow; }
-
-    // Returns the offset relative to the parent fragement's content-box.
-    LayoutUnit inlineOffset() const { return m_inlineOffset; }
-    LayoutUnit blockOffset() const { return m_blockOffset; }
-
-    // Should only be used by the parent fragement's layout.
-    void setOffset(LayoutUnit inlineOffset, LayoutUnit blockOffset);
-
-    DECLARE_TRACE();
-
-private:
-    LayoutUnit m_inlineSize;
-    LayoutUnit m_blockSize;
-
-    LayoutUnit m_inlineOverflow;
-    LayoutUnit m_blockOverflow;
-
-    LayoutUnit m_inlineOffset;
-    LayoutUnit m_blockOffset;
-
-    HeapVector<Member<const NGFragment>> m_children;
-};
-
-} // namespace blink
-
-#endif // NGFragment_h