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

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

 /*
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 #ifndef IDBDatabase_h
 #define IDBDatabase_h
 
 #include "bindings/core/v8/ScriptState.h"
+#include "bindings/core/v8/V8GCRoot.h"
 #include "bindings/modules/v8/UnionTypesModules.h"
 #include "core/dom/ActiveDOMObject.h"
 #include "core/dom/DOMStringList.h"
 #include "modules/EventModules.h"
 #include "modules/EventTargetModules.h"
 #include "modules/ModulesExport.h"
 #include "modules/indexeddb/IDBDatabaseCallbacks.h"
 #include "modules/indexeddb/IDBHistograms.h"
 #include "modules/indexeddb/IDBMetadata.h"
 #include "modules/indexeddb/IDBObjectStore.h"
 #include "modules/indexeddb/IDBObjectStoreParameters.h"
 #include "modules/indexeddb/IDBTransaction.h"
 #include "modules/indexeddb/IndexedDB.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/modules/indexeddb/WebIDBDatabase.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class DOMException;
 class ExceptionState;
 class ExecutionContext;
 
 class MODULES_EXPORT IDBDatabase final
     : public RefCountedGarbageCollectedEventTargetWithInlineData<IDBDatabase>
-    , public ActiveDOMObject {
+    , public ActiveDOMObject
+    , public V8GCRoot {
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(IDBDatabase);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(IDBDatabase);
     DEFINE_WRAPPERTYPEINFO();
 public:
     static IDBDatabase* create(ExecutionContext*, PassOwnPtr<WebIDBDatabase>, IDBDatabaseCallbacks*);
     ~IDBDatabase() override;
     DECLARE_VIRTUAL_TRACE();
 
     void setMetadata(const IDBDatabaseMetadata& metadata) { m_metadata = metadata; }
     void indexCreated(int64_t objectStoreId, const IDBIndexMetadata&);
@@ skipping 84 matching lines @@
     // Keep track of the versionchange events waiting to be fired on this
     // database so that we can cancel them if the database closes.
     WillBeHeapVector<RefPtrWillBeMember<Event>> m_enqueuedEvents;
 
     Member<IDBDatabaseCallbacks> m_databaseCallbacks;
 };
 
 } // namespace blink
 
 #endif // IDBDatabase_h