Move Image ownership out of CSSValue

Source/core/css/CSSImageGeneratorValue.h

Index: Source/core/css/CSSImageGeneratorValue.h
diff --git a/Source/core/css/CSSImageGeneratorValue.h b/Source/core/css/CSSImageGeneratorValue.h
index f664d137220f8e8fb9c009829c1d2d1203dae02d..3d3bbe4d4a22a984e4752439eed75a613af257c2 100644
--- a/Source/core/css/CSSImageGeneratorValue.h
+++ b/Source/core/css/CSSImageGeneratorValue.h
@@ -28,13 +28,16 @@
 
 #include "core/CoreExport.h"
 #include "core/css/CSSValue.h"
+#include "core/style/StyleImage.h"
 #include "platform/geometry/IntSizeHash.h"
 #include "wtf/HashCountedSet.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
+class ComputedStyle;
 class Document;
+class ElementStyleResources;
 class Image;
 class LayoutObject;
 
@@ -63,10 +66,10 @@ public:
     bool isFixedSize() const;
     IntSize fixedSize(const LayoutObject*);
 
-    bool isPending() const;
+    bool isPending(CSSStyleImageMap&) const;
     bool knownToBeOpaque(const LayoutObject*) const;
 
-    void loadSubimages(Document*);
+    void loadSubimages(Document*, CSSStyleImageMap&);
 
     DEFINE_INLINE_TRACE_AFTER_DISPATCH() { CSSValue::traceAfterDispatch(visitor); }