Partial implementation of inline StylePropertyMap.

third_party/WebKit/Source/core/dom/ElementRareData.h

Index: third_party/WebKit/Source/core/dom/ElementRareData.h
diff --git a/third_party/WebKit/Source/core/dom/ElementRareData.h b/third_party/WebKit/Source/core/dom/ElementRareData.h
index 050f4c63072199b6c2968ff701412a0ba0a66ef7..16ab1e63fa828280c7ddcf39cbfa79e9cf843ac4 100644
--- a/third_party/WebKit/Source/core/dom/ElementRareData.h
+++ b/third_party/WebKit/Source/core/dom/ElementRareData.h
@@ -23,6 +23,7 @@
 #define ElementRareData_h
 
 #include "core/animation/ElementAnimations.h"
+#include "core/css/cssom/InlineStylePropertyMap.h"
 #include "core/dom/Attr.h"
 #include "core/dom/CompositorProxiedPropertySet.h"
 #include "core/dom/DatasetDOMStringMap.h"
@@ -70,6 +71,9 @@ public:
     }
 
     CSSStyleDeclaration& ensureInlineCSSStyleDeclaration(Element* ownerElement);
+    InlineStylePropertyMap& ensureInlineStylePropertyMap(Element* ownerElement);
+
+    InlineStylePropertyMap* inlineStylePropertyMap() { return m_cssomMapWrapper.get(); }
 
     void clearShadow() { m_shadow = nullptr; }
     ElementShadow* shadow() const { return m_shadow.get(); }
@@ -150,6 +154,7 @@ private:
     OwnPtrWillBeMember<NamedNodeMap> m_attributeMap;
     OwnPtrWillBeMember<AttrNodeList> m_attrNodeList;
     OwnPtrWillBeMember<InlineCSSStyleDeclaration> m_cssomWrapper;
+    PersistentWillBeMember<InlineStylePropertyMap> m_cssomMapWrapper;
     OwnPtr<CompositorProxiedPropertySet> m_proxiedProperties;
 
     PersistentWillBeMember<ElementAnimations> m_elementAnimations;