Use a two-part data format version in IndexedDB metadata.

content/browser/indexed_db/indexed_db_factory.h

 // Copyright (c) 2013 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 CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_FACTORY_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_FACTORY_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 13 matching lines @@
 #include "url/gurl.h"
 #include "url/origin.h"
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace content {
 
 class IndexedDBBackingStore;
+class IndexedDBDataFormatVersion;
 struct IndexedDBPendingConnection;
 struct IndexedDBDataLossInfo;
 
 class CONTENT_EXPORT IndexedDBFactory
     : NON_EXPORTED_BASE(public base::RefCountedThreadSafe<IndexedDBFactory>) {
  public:
   typedef std::multimap<url::Origin, IndexedDBDatabase*> OriginDBMap;
   typedef OriginDBMap::const_iterator OriginDBMapIterator;
   typedef std::pair<OriginDBMapIterator, OriginDBMapIterator> OriginDBs;
 
   virtual void ReleaseDatabase(const IndexedDBDatabase::Identifier& identifier,
                                bool forced_close) = 0;
 
   virtual void GetDatabaseNames(
       scoped_refptr<IndexedDBCallbacks> callbacks,
       const url::Origin& origin,
       const base::FilePath& data_directory,
+      const IndexedDBDataFormatVersion& client_data_format_version,
       scoped_refptr<net::URLRequestContextGetter> request_context_getter) = 0;
   virtual void Open(
       const base::string16& name,
       std::unique_ptr<IndexedDBPendingConnection> connection,
       scoped_refptr<net::URLRequestContextGetter> request_context_getter,
       const url::Origin& origin,
-      const base::FilePath& data_directory) = 0;
+      const base::FilePath& data_directory,
+      const IndexedDBDataFormatVersion& client_data_format_version) = 0;
 
   virtual void DeleteDatabase(
       const base::string16& name,
       scoped_refptr<net::URLRequestContextGetter> request_context_getter,
       scoped_refptr<IndexedDBCallbacks> callbacks,
       const url::Origin& origin,
       const base::FilePath& data_directory,
+      const IndexedDBDataFormatVersion& client_data_format_version,
       bool force_close) = 0;
 
   virtual void HandleBackingStoreFailure(const url::Origin& origin) = 0;
   virtual void HandleBackingStoreCorruption(
       const url::Origin& origin,
       const IndexedDBDatabaseError& error) = 0;
 
   virtual OriginDBs GetOpenDatabasesForOrigin(
       const url::Origin& origin) const = 0;
 
@@ skipping 14 matching lines @@
 
  protected:
   friend class base::RefCountedThreadSafe<IndexedDBFactory>;
 
   IndexedDBFactory() {}
   virtual ~IndexedDBFactory() {}
 
   virtual scoped_refptr<IndexedDBBackingStore> OpenBackingStore(
       const url::Origin& origin,
       const base::FilePath& data_directory,
+      const IndexedDBDataFormatVersion& client_data_format_version,
       scoped_refptr<net::URLRequestContextGetter> request_context_getter,
       IndexedDBDataLossInfo* data_loss_info,
       bool* disk_full,
       leveldb::Status* status) = 0;
 
   virtual scoped_refptr<IndexedDBBackingStore> OpenBackingStoreHelper(
       const url::Origin& origin,
       const base::FilePath& data_directory,
+      const IndexedDBDataFormatVersion& client_data_format_version,
       scoped_refptr<net::URLRequestContextGetter> request_context_getter,
       IndexedDBDataLossInfo* data_loss_info,
       bool* disk_full,
       bool first_time,
       leveldb::Status* status) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(IndexedDBFactory);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_FACTORY_H_