Improve RAII of StyleResolverState.

Source/core/css/resolver/ElementResolveContext.h

Index: Source/core/css/resolver/ElementResolveContext.h
diff --git a/Source/core/css/resolver/ElementResolveContext.h b/Source/core/css/resolver/ElementResolveContext.h
index 09b8cd105c0b09a52401488136873f525f23432d..1c74738a9f96a23759de44e2eb86665d56dc4320 100644
--- a/Source/core/css/resolver/ElementResolveContext.h
+++ b/Source/core/css/resolver/ElementResolveContext.h
@@ -38,10 +38,11 @@ class ElementResolveContext {
 public:
     explicit ElementResolveContext(const Document&);
 
-    explicit ElementResolveContext(Element&);
+    ElementResolveContext(Element&, RenderStyle* parentStyle);
 
     Element* element() const { return m_element; }
     const ContainerNode* parentNode() const { return m_parentNode; }
+    RenderStyle* parentStyle() const { return m_parentStyle; }
     const RenderStyle* rootElementStyle() const { return m_rootElementStyle; }
     EInsideLink elementLinkState() const { return m_elementLinkState; }
     bool distributedToInsertionPoint() const { return m_distributedToInsertionPoint; }
@@ -49,6 +50,7 @@ public:
 private:
     RawPtrWillBeMember<Element> m_element;
     RawPtrWillBeMember<ContainerNode> m_parentNode;
+    RenderStyle* m_parentStyle;
     RenderStyle* m_rootElementStyle;
     EInsideLink m_elementLinkState;
     bool m_distributedToInsertionPoint;