[v8 gc] Introduce a base class for all objects that can have pending activity

third_party/WebKit/Source/modules/indexeddb/IDBTransaction.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
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  * modification, are permitted provided that the following conditions
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 #ifndef IDBTransaction_h
 #define IDBTransaction_h
 
 #include "bindings/core/v8/ScriptState.h"
+#include "bindings/core/v8/V8GCRoot.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/events/EventListener.h"
 #include "modules/EventModules.h"
 #include "modules/EventTargetModules.h"
 #include "modules/ModulesExport.h"
 #include "modules/indexeddb/IDBMetadata.h"
 #include "modules/indexeddb/IndexedDB.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/indexeddb/WebIDBDatabase.h"
 #include "public/platform/modules/indexeddb/WebIDBTypes.h"
 #include "wtf/HashSet.h"
 
 namespace blink {
 
 class DOMException;
 class ExceptionState;
 class IDBDatabase;
 class IDBObjectStore;
 class IDBOpenDBRequest;
 struct IDBObjectStoreMetadata;
 
 class MODULES_EXPORT IDBTransaction final
     : public RefCountedGarbageCollectedEventTargetWithInlineData<IDBTransaction>
-    , public ActiveDOMObject {
+    , public ActiveDOMObject
+    , public V8GCRoot {
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(IDBTransaction);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(IDBTransaction);
     DEFINE_WRAPPERTYPEINFO();
 public:
     static IDBTransaction* create(ScriptState*, int64_t, const HashSet<String>& objectStoreNames, WebIDBTransactionMode, IDBDatabase*);
     static IDBTransaction* create(ScriptState*, int64_t, IDBDatabase*, IDBOpenDBRequest*, const IDBDatabaseMetadata& previousMetadata);
     ~IDBTransaction() override;
     DECLARE_VIRTUAL_TRACE();
 
     static WebIDBTransactionMode stringToMode(const String&);
@@ skipping 70 matching lines @@
     IDBObjectStoreMap m_objectStoreMap;
 
     HeapHashSet<Member<IDBObjectStore>> m_deletedObjectStores;
     HeapHashMap<Member<IDBObjectStore>, IDBObjectStoreMetadata> m_objectStoreCleanupMap;
     IDBDatabaseMetadata m_previousMetadata;
 };
 
 } // namespace blink
 
 #endif // IDBTransaction_h