Align IndexedDB metadata rollback on transaction abort to spec.

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

Index: third_party/WebKit/Source/modules/indexeddb/IDBIndex.h
diff --git a/third_party/WebKit/Source/modules/indexeddb/IDBIndex.h b/third_party/WebKit/Source/modules/indexeddb/IDBIndex.h
index 041080d529e2b88f50ba00f69004cadb6ad38c75..9cad7f0cb8e0955f88469ff4d868d49fb1da69d1 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBIndex.h
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBIndex.h
@@ -46,9 +46,9 @@ 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();
@@ -71,9 +71,14 @@ public:
     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;
+    void markDeleted()
+    {
+        DCHECK(m_transaction->isVersionChange()) << "Index deleted outside versionchange transaction.";
+        m_deleted = true;
+    }
+    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);
@@ -81,14 +86,14 @@ public:
     WebIDBDatabase* backendDB() const;
 
 private:
-    IDBIndex(const IDBIndexMetadata&, IDBObjectStore*, IDBTransaction*);
+    IDBIndex(RefPtr<IDBIndexMetadata>, IDBObjectStore*, IDBTransaction*);
 
-    const IDBIndexMetadata& metadata() const { return m_metadata; }
+    const IDBIndexMetadata& metadata() const { return *m_metadata; }
 
     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;