[Experimental] Implement some part of custom properties in style maps

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

Index: third_party/WebKit/Source/core/css/cssom/ComputedStylePropertyMap.h
diff --git a/third_party/WebKit/Source/core/css/cssom/ComputedStylePropertyMap.h b/third_party/WebKit/Source/core/css/cssom/ComputedStylePropertyMap.h
index 62334aa709cb7f1984ed7be89597a8d4fbb37484..700834cae1d76457dff8d9d87cf8dd71fba00e1f 100644
--- a/third_party/WebKit/Source/core/css/cssom/ComputedStylePropertyMap.h
+++ b/third_party/WebKit/Source/core/css/cssom/ComputedStylePropertyMap.h
@@ -32,7 +32,6 @@ class CORE_EXPORT ComputedStylePropertyMap : public ImmutableStylePropertyMap {
   Vector<String> getProperties() override;
 
   DEFINE_INLINE_VIRTUAL_TRACE() {
-    visitor->trace(m_computedStyleDeclaration);
     visitor->trace(m_node);
     ImmutableStylePropertyMap::trace(visitor);
   }
@@ -43,19 +42,16 @@ class CORE_EXPORT ComputedStylePropertyMap : public ImmutableStylePropertyMap {
  protected:
   ComputedStylePropertyMap(Node* node, const String& pseudoElement = String())
       : ImmutableStylePropertyMap(),
-        m_computedStyleDeclaration(
-            CSSComputedStyleDeclaration::create(node, false, pseudoElement)),
         m_pseudoId(CSSSelector::parsePseudoId(pseudoElement)),
         m_node(node) {}
 
   CSSStyleValueVector getAllInternal(CSSPropertyID) override;
-  CSSStyleValueVector getAllInternal(AtomicString customPropertyName) override;
+  CSSStyleValueVector getAllInternal(String customPropertyName) override;
 
   HeapVector<StylePropertyMapEntry> getIterationEntries() override {
     return HeapVector<StylePropertyMapEntry>();
   }
 
-  Member<CSSComputedStyleDeclaration> m_computedStyleDeclaration;
   PseudoId m_pseudoId;

[meade_UTC10, 2017/03/02 00:16:59]

I think these members should be private; if you move the private Node* function
above to just above the members, that would be perfect.

   Member<Node> m_node;
 };