Align IndexedDB metadata rollback on transaction abort to spec.

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

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 28 matching lines @@
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class ExceptionState;
 class IDBObjectStore;
 
 class IDBIndex final : public GarbageCollectedFinalized<IDBIndex>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
-    static IDBIndex* create(const IDBIndexMetadata& metadata, IDBObjectStore* objectStore, IDBTransaction* transaction)
+    static IDBIndex* create(RefPtr<IDBIndexMetadata> metadata, IDBObjectStore* objectStore, IDBTransaction* transaction)
     {
-        return new IDBIndex(metadata, objectStore, transaction);
+        return new IDBIndex(std::move(metadata), objectStore, transaction);
     }
     ~IDBIndex();
     DECLARE_TRACE();
 
+    const IDBIndexMetadata& metadata() const { return *m_metadata; }
+
     // Implement the IDL
-    const String& name() const { return m_metadata.name; }
+    const String& name() const { return metadata().name; }
     void setName(const String& name, ExceptionState&);
     IDBObjectStore* objectStore() const { return m_objectStore.get(); }
     ScriptValue keyPath(ScriptState*) const;
-    bool unique() const { return m_metadata.unique; }
-    bool multiEntry() const { return m_metadata.multiEntry; }
+    bool unique() const { return metadata().unique; }
+    bool multiEntry() const { return metadata().multiEntry; }
 
     IDBRequest* openCursor(ScriptState*, const ScriptValue& key, const String& direction, ExceptionState&);
     IDBRequest* openKeyCursor(ScriptState*, const ScriptValue& range, const String& direction, ExceptionState&);
     IDBRequest* count(ScriptState*, const ScriptValue& range, ExceptionState&);
     IDBRequest* get(ScriptState*, const ScriptValue& key, ExceptionState&);
     IDBRequest* getAll(ScriptState*, const ScriptValue& range, ExceptionState&);
     IDBRequest* getAll(ScriptState*, const ScriptValue& range, unsigned long maxCount, ExceptionState&);
     IDBRequest* getKey(ScriptState*, const ScriptValue& key, ExceptionState&);
     IDBRequest* getAllKeys(ScriptState*, const ScriptValue& range, ExceptionState&);
     IDBRequest* getAllKeys(ScriptState*, const ScriptValue& range, uint32_t maxCount, ExceptionState&);
 
     void markDeleted() { m_deleted = true; }
-    bool isDeleted() const;
-    int64_t id() const { return m_metadata.id; }
+    bool isDeleted() const { return m_deleted; }
+    int64_t id() const { return metadata().id; }
+    void revertMetadata(RefPtr<IDBIndexMetadata> oldMetadata);
 
     // Used internally and by InspectorIndexedDBAgent:
     IDBRequest* openCursor(ScriptState*, IDBKeyRange*, WebIDBCursorDirection);
 
     WebIDBDatabase* backendDB() const;
 
 private:
-    IDBIndex(const IDBIndexMetadata&, IDBObjectStore*, IDBTransaction*);
+    IDBIndex(RefPtr<IDBIndexMetadata>, IDBObjectStore*, IDBTransaction*);
 
     IDBRequest* getInternal(ScriptState*, const ScriptValue& key, ExceptionState&, bool keyOnly);
     IDBRequest* getAllInternal(ScriptState*, const ScriptValue& range, unsigned long maxCount, ExceptionState&, bool keyOnly);
 
-    IDBIndexMetadata m_metadata;
+    RefPtr<IDBIndexMetadata> m_metadata;
     Member<IDBObjectStore> m_objectStore;
     Member<IDBTransaction> m_transaction;
     bool m_deleted = false;
 };
 
 } // namespace blink
 
 #endif // IDBIndex_h