Introduce CSS_VALUE_TYPE_CASTS macro to cast CSSValue

Source/core/css/CSSValue.h

Index: Source/core/css/CSSValue.h
diff --git a/Source/core/css/CSSValue.h b/Source/core/css/CSSValue.h
index a92bc86a5b532c845ed46447042e49ce06f66424..20711c10fa677cdeab991fab63da72a2e670d9a7 100644
--- a/Source/core/css/CSSValue.h
+++ b/Source/core/css/CSSValue.h
@@ -237,6 +237,20 @@ inline bool compareCSSValuePtr(const RefPtr<CSSValueType>& first, const RefPtr<C
     return first ? second && first->equals(*second) : !second;
 }
 
+#define CSS_VALUE_TYPE_CASTS(ValueTypeName) \

[tkent, 2013/09/24 00:08:34]

I think DEFINE_CSS_VALUE_TYPE_CASTS is better.  It's consistent with
DEFINE_ATTRIBUTE_EVENT_LISTENER.

+inline const CSS##ValueTypeName* toCSS##ValueTypeName(const CSSValue* value) \
+{ \
+    ASSERT_WITH_SECURITY_IMPLICATION(!value || value->is##ValueTypeName()); \
+    return static_cast<const CSS##ValueTypeName*>(value); \
+} \
+inline CSS##ValueTypeName* toCSS##ValueTypeName(CSSValue* value) \
+{ \
+    ASSERT_WITH_SECURITY_IMPLICATION(!value || value->is##ValueTypeName()); \
+    return static_cast<CSS##ValueTypeName*>(value); \
+} \
+void toCSS##ValueTypeName(const CSS##ValueTypeName*); \
+void toCSS##ValueTypeName(const CSS##ValueTypeName&);

[tkent, 2013/09/24 00:08:34]

Please omit the last ':'.  I'd like to use this like
"CSS_VALUE_TYPE_CASTS(Foo);"

+
 } // namespace WebCore
 
 #endif // CSSValue_h