First implementation of lazily cached accessor for DOM attributes.

third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.h

Index: third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.h b/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.h
index e59d59a0085dbc6db6c395a936cd03466c51c32b..1b4a85914f1d18ede5b109dac914e069d1cebb1b 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.h
+++ b/third_party/WebKit/Source/bindings/core/v8/V8DOMConfiguration.h
@@ -73,6 +73,8 @@ class CORE_EXPORT V8DOMConfiguration final {
   };
 
   typedef v8::Local<v8::Private> (*CachedPropertyKey)(v8::Isolate*);
+  typedef void (*CachedAccessorInitCallback)(v8::Isolate*,
+                                             v8::Local<v8::Object>);
 
   // AttributeConfiguration translates into calls to SetNativeDataProperty() on
   // either the instance or the prototype ObjectTemplate, based on
@@ -83,10 +85,7 @@ class CORE_EXPORT V8DOMConfiguration final {
     const char* const name;
     v8::AccessorNameGetterCallback getter;
     v8::AccessorNameSetterCallback setter;
-    // TODO(vogelheim): This has to be removed too since it's only used in
-    //                  accessors.
-    // The accessor's 'result' is stored in a private property.
-    CachedPropertyKey cached_property_key;
+
     const WrapperTypeInfo* data;
     // v8::PropertyAttribute
     unsigned attribute : 8;
@@ -142,6 +141,7 @@ class CORE_EXPORT V8DOMConfiguration final {
     v8::FunctionCallback setter;
     // The accessor's 'result' is stored in a private property.
     CachedPropertyKey cached_property_key;
+    CachedAccessorInitCallback cached_accessor_init_callback;
     const WrapperTypeInfo* data;
     // v8::PropertyAttribute
     unsigned attribute : 8;