Cache cssomWrappers for StylePropertySets directly on the MutableStylePropertySet.

Source/core/css/StylePropertySet.h

Index: Source/core/css/StylePropertySet.h
diff --git a/Source/core/css/StylePropertySet.h b/Source/core/css/StylePropertySet.h
index 3fed4302f2db09da3ccb9aca97bd3c3cb4db6ddb..c115a87a6261e4a96a7fb3b3a882762c39e0c203 100644
--- a/Source/core/css/StylePropertySet.h
+++ b/Source/core/css/StylePropertySet.h
@@ -25,6 +25,7 @@
 #include "core/css/CSSParserMode.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/CSSProperty.h"
+#include "core/css/PropertySetCSSStyleDeclaration.h"
 #include <wtf/ListHashSet.h>
 #include <wtf/text/WTFString.h>
 #include <wtf/Vector.h>
@@ -37,7 +38,6 @@ class Element;
 class ImmutableStylePropertySet;
 class KURL;
 class MutableStylePropertySet;
-class PropertySetCSSStyleDeclaration;
 class StylePropertyShorthand;
 class StyleSheetContents;
 
@@ -174,8 +174,6 @@ inline const StylePropertyMetadata* ImmutableStylePropertySet::metadataArray() c
 
 class MutableStylePropertySet : public StylePropertySet {
 public:
-    ~MutableStylePropertySet();
-
     static PassRefPtr<MutableStylePropertySet> create(CSSParserMode = CSSQuirksMode);
     static PassRefPtr<MutableStylePropertySet> create(const CSSProperty* properties, unsigned count);
 
@@ -216,14 +214,12 @@ public:
     Vector<CSSProperty, 4> m_propertyVector;
 
 private:
-    MutableStylePropertySet(CSSParserMode cssParserMode)
-        : StylePropertySet(cssParserMode)
-    { }
-
+    MutableStylePropertySet(CSSParserMode);

[abarth-chromium, 2013/07/03 18:25:42]

Please mark one-argument constructors "explicit"

[Mads Ager (chromium), 2013/07/04 06:05:47]

Done for this one and the constructor in the public section. Moved that
constructor to the private section now that I have StylePropertySet as a friend
here (for the hasCSSOMWrapper method).

     MutableStylePropertySet(const CSSProperty* properties, unsigned count);
 
     bool removeShorthandProperty(CSSPropertyID);
     CSSProperty* findCSSPropertyWithID(CSSPropertyID);
+    OwnPtr<PropertySetCSSStyleDeclaration> m_cssomWrapper;
 };
 
 inline StylePropertyMetadata StylePropertySet::PropertyReference::propertyMetadata() const