Fix incorrect style recalculation of text-decoration properties.

Source/core/rendering/style/AppliedTextDecoration.h

Index: Source/core/rendering/style/AppliedTextDecoration.h
diff --git a/Source/core/rendering/style/AppliedTextDecoration.h b/Source/core/rendering/style/AppliedTextDecoration.h
index 680254b8980e9062d978a64fbd567f2dddf222a9..fd0df809194b4af430940da01c62a70fa96ab844 100644
--- a/Source/core/rendering/style/AppliedTextDecoration.h
+++ b/Source/core/rendering/style/AppliedTextDecoration.h
@@ -5,22 +5,28 @@
 #ifndef AppliedTextDecoration_h
 #define AppliedTextDecoration_h
 
+#include "core/css/StyleColor.h"
 #include "core/rendering/style/RenderStyleConstants.h"
 
 namespace WebCore {
 
 class AppliedTextDecoration {
 public:
+    AppliedTextDecoration(TextDecoration, TextDecorationStyle, StyleColor);
     explicit AppliedTextDecoration(TextDecoration);
     AppliedTextDecoration();
 
     TextDecoration line() const { return static_cast<TextDecoration>(m_line); }
+    TextDecorationStyle style() const { return static_cast<TextDecorationStyle>(m_style); }
 
+    bool isSimpleUnderline() const { return m_line == TextDecorationUnderline && m_style == TextDecorationStyleSolid && m_color.isCurrentColor(); }
     bool operator==(const AppliedTextDecoration&) const;
     bool operator!=(const AppliedTextDecoration& o) const { return !(*this == o); }
 
 private:
     unsigned m_line : TextDecorationBits;
+    unsigned m_style : 3; // TextDecorationStyle
+    StyleColor m_color;
 };
 
 } // namespace WebCore