Proper support for multiple text decorations.

Source/core/rendering/RenderObject.h

Index: Source/core/rendering/RenderObject.h
diff --git a/Source/core/rendering/RenderObject.h b/Source/core/rendering/RenderObject.h
index 9c768705a9a7c733437f053dcfa698dd8e57ffa1..a20e0e7d01698e00590b2591ed23906d6012bee3 100644
--- a/Source/core/rendering/RenderObject.h
+++ b/Source/core/rendering/RenderObject.h
@@ -800,13 +800,18 @@ public:
 
     virtual CursorDirective getCursor(const LayoutPoint&, Cursor&) const;
 
-    struct AppliedTextDecoration {
-        Color color;
+    struct ResolvedDecoration {
+        ResolvedDecoration();
+        ResolvedDecoration(const AppliedTextDecoration&, const Color&);
+
+        TextDecoration line;
         TextDecorationStyle style;
-        AppliedTextDecoration() : color(Color::transparent), style(TextDecorationStyleSolid) { }
+        Color color;
     };
 
-    void getTextDecorations(unsigned decorations, AppliedTextDecoration& underline, AppliedTextDecoration& overline, AppliedTextDecoration& linethrough, bool quirksMode = false, bool firstlineStyle = false);
+    typedef Vector<ResolvedDecoration, 1> ResolvedDecorationVector;
+
+    void resolvedDecorations(bool firstlineStyle, const Vector<AppliedTextDecoration>&, ResolvedDecorationVector&);
 
     // Return the RenderLayerModelObject in the container chain which is responsible for painting this object, or 0
     // if painting is root-relative. This is the container that should be passed to the 'forRepaint'