[CachedAccessor] for window.document.

third_party/WebKit/Source/bindings/core/v8/V8PrivateProperty.h

Index: third_party/WebKit/Source/bindings/core/v8/V8PrivateProperty.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8PrivateProperty.h b/third_party/WebKit/Source/bindings/core/v8/V8PrivateProperty.h
index 2c1da757e4014984c83d7d7bb2b2b03531c8daa9..762a34e11ae92a327807c44d1ef4d34eea7cf009 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8PrivateProperty.h
+++ b/third_party/WebKit/Source/bindings/core/v8/V8PrivateProperty.h
@@ -34,7 +34,8 @@ class ScriptWrappable;
   X(SameObject, NotificationActions)    \
   X(SameObject, NotificationData)       \
   X(SameObject, NotificationVibrate)    \
-  X(V8NodeFilterCondition, Filter)
+  X(V8NodeFilterCondition, Filter)      \
+  X(Window, DocumentCachedAccessor)
 
 // The getter's name for a private property.
 #define V8_PRIVATE_PROPERTY_GETTER_NAME(InterfaceName, PrivateKeyName) \
@@ -105,6 +106,8 @@ class CORE_EXPORT V8PrivateProperty {
       return v8CallBoolean(object->SetPrivate(context, m_privateSymbol, value));
     }
 
+    v8::Local<v8::Private> getPrivate() { return m_privateSymbol; }
+
    private:
     friend class V8PrivateProperty;
     // The following classes are exceptionally allowed to call to