[Typed CSSOM] New design for computed styles which includes custom properties

third_party/WebKit/Source/core/css/cssom/ComputedStylePropertyMap.h

 // Copyright 2016 the Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ComputedStylePropertyMap_h
 #define ComputedStylePropertyMap_h
 
 #include "core/css/CSSComputedStyleDeclaration.h"
 #include "core/css/cssom/StylePropertyMapReadonly.h"
 #include "core/dom/Node.h"
@@ skipping 14 matching lines @@
 
  public:
   static ComputedStylePropertyMap* Create(Node* node,
                                           const String& pseudo_element) {
     return new ComputedStylePropertyMap(node, pseudo_element);
   }
 
   Vector<String> getProperties() override;
 
   DEFINE_INLINE_VIRTUAL_TRACE() {
-    visitor->Trace(computed_style_declaration_);
     visitor->Trace(node_);
     StylePropertyMapReadonly::Trace(visitor);
   }
 
- private:
-  Node* GetNode() const;
-
  protected:
   ComputedStylePropertyMap(Node* node, const String& pseudo_element = String())
       : StylePropertyMapReadonly(),
-        computed_style_declaration_(
-            CSSComputedStyleDeclaration::Create(node, false, pseudo_element)),
         pseudo_id_(CSSSelector::ParsePseudoId(pseudo_element)),
         node_(node) {}
 
   CSSStyleValueVector GetAllInternal(CSSPropertyID) override;
   CSSStyleValueVector GetAllInternal(
       AtomicString custom_property_name) override;
 
   HeapVector<StylePropertyMapEntry> GetIterationEntries() override {
     return HeapVector<StylePropertyMapEntry>();
   }
 
-  Member<CSSComputedStyleDeclaration> computed_style_declaration_;
   PseudoId pseudo_id_;
   Member<Node> node_;
+
+ private:
+  Node* StyledNode() const;
+  const ComputedStyle* UpdateStyle() const;
 };
 
 }  // namespace blink
 
 #endif