Add server_attachment_metadata field to EntryKernel and sync database.

sync/syncable/entry.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_H_
 #define SYNC_SYNCABLE_ENTRY_H_
 
 #include "sync/base/sync_export.h"
 #include "sync/syncable/entry_kernel.h"
 
@@ skipping 192 matching lines @@
   const UniquePosition& GetUniquePosition() const {
     DCHECK(kernel_);
     return kernel_->ref(UNIQUE_POSITION);
   }
 
   const sync_pb::AttachmentMetadata& GetAttachmentMetadata() const {
     DCHECK(kernel_);
     return kernel_->ref(ATTACHMENT_METADATA);
   }
 
+  const sync_pb::AttachmentMetadata& GetServerAttachmentMetadata() const {
+    DCHECK(kernel_);
+    return kernel_->ref(SERVER_ATTACHMENT_METADATA);
+  }
+
   bool GetSyncing() const {
     DCHECK(kernel_);
     return kernel_->ref(SYNCING);
   }
 
   ModelType GetServerModelType() const;
   ModelType GetModelType() const;
 
   Id GetPredecessorId() const;
   Id GetSuccessorId() const;
@@ skipping 55 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(Entry);
 };
 
 std::ostream& operator<<(std::ostream& os, const Entry& entry);
 
 }  // namespace syncable
 }  // namespace syncer
 
 #endif  // SYNC_SYNCABLE_ENTRY_H_