The HTML parser synchronously creates custom elements

third_party/WebKit/Source/core/dom/custom/CustomElementsRegistry.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 CustomElementsRegistry_h
 #define CustomElementsRegistry_h
 
 #include "base/gtest_prod_util.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/HashSet.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/text/AtomicString.h"
 #include "wtf/text/AtomicStringHash.h"
 
 namespace blink {
 
 class CustomElementDefinition;
 class CustomElementDefinitionBuilder;
 class CustomElementDescriptor;
-class Document;
 class Element;
 class ElementRegistrationOptions;
 class ExceptionState;
+class LocalDOMWindow;
 class ScriptPromiseResolver;
 class ScriptState;
 class ScriptValue;
 class V0CustomElementRegistrationContext;
 
 class CORE_EXPORT CustomElementsRegistry final

[kouhei (in TOK), 2016/08/15 02:10:31]

Optional: It would be nice if the object graph change here is documented in the
CL desc.

     : public GarbageCollectedFinalized<CustomElementsRegistry>
     , public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
     WTF_MAKE_NONCOPYABLE(CustomElementsRegistry);
 public:
-    static CustomElementsRegistry* create(Document*);
+    static CustomElementsRegistry* create(const LocalDOMWindow*);
 
     virtual ~CustomElementsRegistry() = default;
 
     void define(
         ScriptState*,
         const AtomicString& name,
         const ScriptValue& constructor,
         const ElementRegistrationOptions&,
         ExceptionState&);
 
     void define(
         const AtomicString& name,
         CustomElementDefinitionBuilder&,
         const ElementRegistrationOptions&,
         ExceptionState&);
 
     ScriptValue get(const AtomicString& name);
     bool nameIsDefined(const AtomicString& name) const;
     CustomElementDefinition* definitionForName(const AtomicString& name) const;
 
+    // TODO(dominicc): Switch most callers of definitionForName to
+    // definitionFor when implementing type extensions.
+    CustomElementDefinition* definitionFor(const CustomElementDescriptor&) const;
+
     // TODO(dominicc): Consider broadening this API when type extensions are
     // implemented.
     void addCandidate(Element*);
     ScriptPromise whenDefined(
         ScriptState*,
         const AtomicString& name,
         ExceptionState&);
 
+    void entangle(V0CustomElementRegistrationContext*);
+
     DECLARE_TRACE();
 
 private:
-    friend class CustomElementsRegistryTestBase;
+    friend class CustomElementsRegistryTest;
 
-    CustomElementsRegistry(Document*);
+    CustomElementsRegistry(const LocalDOMWindow*);
 
-    V0CustomElementRegistrationContext* v0();
     bool v0NameIsDefined(const AtomicString& name);
 
     void collectCandidates(
         const CustomElementDescriptor&,
         HeapVector<Member<Element>>*);
 
     class NameIsBeingDefined;
 
     HashSet<AtomicString> m_namesBeingDefined;
     using DefinitionMap =
         HeapHashMap<AtomicString, Member<CustomElementDefinition>>;
     DefinitionMap m_definitions;
 
-    Member<Document> m_document;
+    Member<const LocalDOMWindow> m_owner;
+
+    using V0RegistrySet = HeapHashSet<WeakMember<V0CustomElementRegistrationContext>>;
+    Member<V0RegistrySet> m_v0;
 
     using UpgradeCandidateSet = HeapHashSet<WeakMember<Element>>;
     using UpgradeCandidateMap = HeapHashMap<
         AtomicString,
         Member<UpgradeCandidateSet>>;
     Member<UpgradeCandidateMap> m_upgradeCandidates;
 
     using WhenDefinedPromiseMap =
         HeapHashMap<AtomicString, Member<ScriptPromiseResolver>>;
     WhenDefinedPromiseMap m_whenDefinedPromiseMap;
 };
 
 } // namespace blink
 
 #endif // CustomElementsRegistry_h