Move StyleBackgroundData.h to a nested class in ComputedStyle.

third_party/WebKit/Source/core/style/StyleBackgroundData.h

-/*
- * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
- *           (C) 2000 Antti Koivisto (koivisto@kde.org)
- *           (C) 2000 Dirk Mueller (mueller@kde.org)
- * Copyright (C) 2003, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
- * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- *
- */
-
-#ifndef StyleBackgroundData_h
-#define StyleBackgroundData_h
-
-#include "core/css/StyleColor.h"
-#include "core/style/FillLayer.h"
-#include "platform/graphics/Color.h"
-#include "platform/wtf/PassRefPtr.h"
-#include "platform/wtf/RefCounted.h"
-
-namespace blink {
-
-// TODO(sashab): Move this into a private class on ComputedStyle, and remove
-// all methods on it, merging them into copy/creation methods on ComputedStyle
-// instead. Keep the allocation logic, only allocating a new object if needed.
-class CORE_EXPORT StyleBackgroundData
-    : public RefCountedCopyable<StyleBackgroundData> {
- public:
-  static PassRefPtr<StyleBackgroundData> Create() {
-    return AdoptRef(new StyleBackgroundData);
-  }
-  PassRefPtr<StyleBackgroundData> Copy() const {
-    return AdoptRef(new StyleBackgroundData(*this));
-  }
-
-  bool operator==(const StyleBackgroundData& other) const {
-    return background_ == other.background_ &&
-           background_color_ == other.background_color_;
-  }
-  bool operator!=(const StyleBackgroundData& other) const {
-    return !(*this == other);
-  }
-
- private:
-  friend class ComputedStyle;
-
-  StyleBackgroundData()
-      : background_(FillLayer(kBackgroundFillLayer, true)),
-        background_color_(Color::kTransparent) {}
-
-  StyleBackgroundData(const StyleBackgroundData&) = default;
-
-  FillLayer background_;
-  StyleColor background_color_;
-};
-
-}  // namespace blink
-
-#endif  // StyleBackgroundData_h