[sync] Componentize sync: Part 2: Add SYNC_EXPORTs to files in src/sync/

sync/protocol/sync_protocol_error.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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_PROTOCOL_SYNC_PROTOCOL_ERROR_H_
 #define SYNC_PROTOCOL_SYNC_PROTOCOL_ERROR_H_
 
 #include <string>
 
 #include "base/values.h"
+#include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base/model_type.h"
 
 namespace syncer{
 
 enum SyncProtocolErrorType {
   // Success case.
   SYNC_SUCCESS,
 
   // Birthday does not match that of the server.
   NOT_MY_BIRTHDAY,
@@ skipping 35 matching lines @@
   // Stop sync and restart sync.
   STOP_AND_RESTART_SYNC,
 
   // Wipe this client of any sync data.
   DISABLE_SYNC_ON_CLIENT,
 
   // The default. No action.
   UNKNOWN_ACTION
 };
 
-struct SyncProtocolError {
+struct SYNC_EXPORT SyncProtocolError {
   SyncProtocolErrorType error_type;
   std::string error_description;
   std::string url;
   ClientAction action;
   ModelTypeSet error_data_types;
   SyncProtocolError();
   ~SyncProtocolError();
   DictionaryValue* ToValue() const;
 };
 
-const char* GetSyncErrorTypeString(SyncProtocolErrorType type);
-const char* GetClientActionString(ClientAction action);
+SYNC_EXPORT const char* GetSyncErrorTypeString(SyncProtocolErrorType type);
+SYNC_EXPORT const char* GetClientActionString(ClientAction action);
 }  // namespace syncer
 #endif  // SYNC_PROTOCOL_SYNC_PROTOCOL_ERROR_H_