First implementation of lazily cached accessor for DOM attributes.

third_party/WebKit/Source/platform/bindings/V8PrivateProperty.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 V8PrivateProperty_h
 #define V8PrivateProperty_h
 
 #include <memory>
 
 #include "platform/PlatformExport.h"
@@ skipping 21 matching lines @@
   X(CustomElement, IsInterfacePrototypeObject)        \
   X(CustomElement, NamespaceURI)                      \
   X(CustomElement, RegistryMap)                       \
   X(CustomElement, TagName)                           \
   X(CustomElement, Type)                              \
   X(CustomElementLifecycle, AttachedCallback)         \
   X(CustomElementLifecycle, AttributeChangedCallback) \
   X(CustomElementLifecycle, CreatedCallback)          \
   X(CustomElementLifecycle, DetachedCallback)         \
   X(DOMException, Error)                              \
+  X(Element, IdCachedAccessor)                        \
   X(ErrorEvent, Error)                                \
   X(FetchEvent, Request)                              \
   X(Global, Event)                                    \
+  X(HTMLElement, TitleCachedAccessor)                 \
+  X(HTMLElement, LangCachedAccessor)                  \
   X(IDBCursor, Request)                               \
   X(IDBObserver, Callback)                            \
   X(InternalBody, Buffer)                             \
   X(InternalBody, Stream)                             \
   X(IntersectionObserver, Callback)                   \
   X(LazyEventListener, ToString)                      \
   X(MessageChannel, Port1)                            \
   X(MessageChannel, Port2)                            \
   X(MessageEvent, CachedData)                         \
   X(MutationObserver, Callback)                       \
@@ skipping 158 matching lines @@
   // TODO(peria): Do not use this specialized hack for
   // Window#DocumentCachedAccessor. This is required to put v8::Private key in
   // a snapshot, and it cannot be a v8::Eternal<> due to V8 serializer's
   // requirement.
   ScopedPersistent<v8::Private> symbol_window_document_cached_accessor_;
 };
 
 }  // namespace blink
 
 #endif  // V8PrivateProperty_h