Proper support for multiple text decorations.

Source/core/rendering/style/AppliedTextDecoration.h

+// Copyright 2014 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 AppliedTextDecoration_h
+#define AppliedTextDecoration_h
+
+#include "core/rendering/style/RenderStyleConstants.h"
+#include "platform/graphics/Color.h"
+
+namespace WebCore {
+
+class AppliedTextDecoration {
+public:
+    AppliedTextDecoration(TextDecoration, TextDecorationStyle, Color);
+    AppliedTextDecoration() { }

[esprehn, 2014/03/31 17:41:24]

This leaves values uninitialized. I don't think you ever want this.

+    AppliedTextDecoration(const AppliedTextDecoration&);
+
+    TextDecoration line() const { return static_cast<TextDecoration>(m_line); }
+    TextDecorationStyle style() const { return static_cast<TextDecorationStyle>(m_style); }
+    const Color& color() const { return m_color; }
+
+    bool operator==(const AppliedTextDecoration&) const;
+    bool operator!=(const AppliedTextDecoration& o) const { return !(*this == o); }
+
+private:
+
+    unsigned m_line : TextDecorationBits;
+    unsigned m_style : 3; // TextDecorationStyle
+    Color m_color;
+};
+
+} // namespace WebCore
+
+#endif // AppliedTextDecoration_h