Add server_attachment_metadata field to EntryKernel and sync database.

sync/test/test_directory_backing_store.h

 // Copyright (c) 2012 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 SYNC_TEST_TEST_DIRECTORY_BACKING_STORE_H_
 #define SYNC_TEST_TEST_DIRECTORY_BACKING_STORE_H_
 
 #include "base/gtest_prod_util.h"
 #include "sync/syncable/directory_backing_store.h"
 
@@ skipping 33 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion78To79);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion79To80);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion80To81);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion81To82);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion82To83);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion83To84);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion84To85);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion85To86);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion86To87);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion87To88);
+  FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateVersion88To89);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, DetectInvalidPosition);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, ModelTypeIds);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, Corruption);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, DeleteEntries);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, GenerateCacheGUID);
   FRIEND_TEST_ALL_PREFIXES(MigrationTest, ToCurrentVersion);
   FRIEND_TEST_ALL_PREFIXES(DirectoryBackingStoreTest, MigrateToLatestAndDump);
   friend class MigrationTest;
 };
 
 }  // namespace syncable
 }  // namespace syncer
 
 #endif  // SYNC_TEST_TEST_DIRECTORY_BACKING_STORE_H_