Add server_attachment_metadata field to EntryKernel and sync database.

sync/syncable/entry_kernel.h

 // Copyright 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_SYNCABLE_ENTRY_KERNEL_H_
 #define SYNC_SYNCABLE_ENTRY_KERNEL_H_
 
 #include <set>
 
 #include "base/time/time.h"
@@ skipping 146 matching lines @@
 };
 
 enum {
   UNIQUE_POSITION_FIELDS_COUNT =
       UNIQUE_POSITION_FIELDS_END - UNIQUE_POSITION_FIELDS_BEGIN,
   ATTACHMENT_METADATA_FIELDS_BEGIN = UNIQUE_POSITION_FIELDS_END
 };
 
 enum AttachmentMetadataField {
   ATTACHMENT_METADATA = ATTACHMENT_METADATA_FIELDS_BEGIN,
+  SERVER_ATTACHMENT_METADATA,
   ATTACHMENT_METADATA_FIELDS_END
 };
 
 enum {
   ATTACHMENT_METADATA_FIELDS_COUNT =
       ATTACHMENT_METADATA_FIELDS_END - ATTACHMENT_METADATA_FIELDS_BEGIN,
   FIELD_COUNT = ATTACHMENT_METADATA_FIELDS_END - BEGIN_FIELDS,
   // Past this point we have temporaries, stored in memory only.
   BEGIN_TEMPS = ATTACHMENT_METADATA_FIELDS_END,
   BIT_TEMPS_BEGIN = BEGIN_TEMPS,
@@ skipping 202 matching lines @@
     const EntryKernelMutation& mutation);
 
 // Caller owns the return value.
 base::ListValue* EntryKernelMutationMapToValue(
     const EntryKernelMutationMap& mutations);
 
 }  // namespace syncable
 }  // namespace syncer
 
 #endif // SYNC_SYNCABLE_ENTRY_KERNEL_H_