Proper support for multiple text decorations.

Source/core/rendering/style/StyleRareInheritedData.cpp

Index: Source/core/rendering/style/StyleRareInheritedData.cpp
diff --git a/Source/core/rendering/style/StyleRareInheritedData.cpp b/Source/core/rendering/style/StyleRareInheritedData.cpp
index 5c59d2fd05f4d3cc79aaf89b146f0807c541cf73..b544d0542198bcd829993a98c3a47558900fa6b8 100644
--- a/Source/core/rendering/style/StyleRareInheritedData.cpp
+++ b/Source/core/rendering/style/StyleRareInheritedData.cpp
@@ -22,6 +22,7 @@
 #include "config.h"
 #include "core/rendering/style/StyleRareInheritedData.h"
 
+#include "core/rendering/style/AppliedTextDecorationList.h"
 #include "core/rendering/style/CursorList.h"
 #include "core/rendering/style/QuotesData.h"
 #include "core/rendering/style/RenderStyle.h"
@@ -38,7 +39,7 @@ struct SameSizeAsStyleRareInheritedData : public RefCounted<SameSizeAsStyleRareI
     Color colors[5];
     void* ownPtrs[1];
     AtomicString atomicStrings[4];
-    void* refPtrs[2];
+    void* refPtrs[3];
     Length lengths[1];
     float secondFloat;
     unsigned m_bitfields[2];
@@ -149,6 +150,7 @@ StyleRareInheritedData::StyleRareInheritedData(const StyleRareInheritedData& o)
     , textEmphasisCustomMark(o.textEmphasisCustomMark)
     , m_tabSize(o.m_tabSize)
     , tapHighlightColor(o.tapHighlightColor)
+    , appliedTextDecorations(o.appliedTextDecorations)
 {
 }
 
@@ -165,6 +167,11 @@ static bool cursorDataEquivalent(const CursorList* c1, const CursorList* c2)
     return (*c1 == *c2);
 }
 
+static bool appliedTextDecorationsEquivalent(const AppliedTextDecorationList* d1, const AppliedTextDecorationList* d2)
+{
+    return (d1 == d2) || (d1 && d2 && *d1 == *d2);
+}
+
 bool StyleRareInheritedData::operator==(const StyleRareInheritedData& o) const
 {
     return m_textStrokeColor == o.m_textStrokeColor
@@ -219,7 +226,8 @@ bool StyleRareInheritedData::operator==(const StyleRareInheritedData& o) const
         && m_imageRendering == o.m_imageRendering
         && m_textUnderlinePosition == o.m_textUnderlinePosition
         && m_rubyPosition == o.m_rubyPosition
-        && StyleImage::imagesEquivalent(listStyleImage.get(), o.listStyleImage.get());
+        && StyleImage::imagesEquivalent(listStyleImage.get(), o.listStyleImage.get())
+        && appliedTextDecorationsEquivalent(appliedTextDecorations.get(), o.appliedTextDecorations.get());
 }
 
 bool StyleRareInheritedData::shadowDataEquivalent(const StyleRareInheritedData& o) const