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

content/browser/indexed_db/indexed_db_factory_impl.h

 // Copyright (c) 2014 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_IMPL_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_FACTORY_IMPL_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 14 matching lines @@
 class IndexedDBContextImpl;
 
 class CONTENT_EXPORT IndexedDBFactoryImpl : public IndexedDBFactory {
  public:
   explicit IndexedDBFactoryImpl(IndexedDBContextImpl* context);
 
   // content::IndexedDBFactory overrides:
   void ReleaseDatabase(const IndexedDBDatabase::Identifier& identifier,
                        bool forced_close) override;
 
-  void GetDatabaseNames(scoped_refptr<IndexedDBCallbacks> callbacks,
-                        const url::Origin& origin,
-                        const base::FilePath& data_directory,
-                        scoped_refptr<net::URLRequestContextGetter>
-                            request_context_getter) override;
-  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) override;
+  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)
+      override;
+  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,
+      const IndexedDBDataFormatVersion& client_data_format_version) override;
 
   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) override;
 
   void HandleBackingStoreFailure(const url::Origin& origin) override;
   void HandleBackingStoreCorruption(
       const url::Origin& origin,
       const IndexedDBDatabaseError& error) override;
 
   OriginDBs GetOpenDatabasesForOrigin(const url::Origin& origin) const override;
 
   void ForceClose(const url::Origin& origin) override;
@@ skipping 10 matching lines @@
       const IndexedDBDatabase::Identifier& identifier) override;
 
   size_t GetConnectionCount(const url::Origin& origin) const override;
 
  protected:
   ~IndexedDBFactoryImpl() override;
 
   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* s) override;
 
   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* s) override;
 
   void ReleaseBackingStore(const url::Origin& origin, bool immediate);
   void CloseBackingStore(const url::Origin& origin);
   IndexedDBContextImpl* context() const { return context_; }
 
@@ skipping 35 matching lines @@
   std::map<url::Origin, scoped_refptr<IndexedDBBackingStore>>
       backing_stores_with_active_blobs_;
   std::set<url::Origin> backends_opened_since_boot_;
 
   DISALLOW_COPY_AND_ASSIGN(IndexedDBFactoryImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_FACTORY_IMPL_H_