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

sync/internal_api/public/write_transaction.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_INTERNAL_API_PUBLIC_WRITE_TRANSACTION_H_
 #define SYNC_INTERNAL_API_PUBLIC_WRITE_TRANSACTION_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base_transaction.h"
 
 namespace tracked_objects {
 class Location;
 }  // namespace tracked_objects
 
 namespace syncer {
 
 namespace syncable {
 class BaseTransaction;
 class WriteTransaction;
 }  // namespace syncable
 
 // Sync API's WriteTransaction is a read/write BaseTransaction.  It wraps
 // a syncable::WriteTransaction.
 //
 // NOTE: Only a single model type can be mutated for a given
 // WriteTransaction.
-class WriteTransaction : public BaseTransaction {
+class SYNC_EXPORT WriteTransaction : public BaseTransaction {
  public:
   // Start a new read/write transaction.
   WriteTransaction(const tracked_objects::Location& from_here,
                    UserShare* share);
   // |transaction_version| stores updated model and nodes version if model
   // is changed by the transaction, or syncer::syncable::kInvalidTransaction
   // if not after transaction is closed. This constructor is used for model
   // types that support embassy data.
   WriteTransaction(const tracked_objects::Location& from_here,
                    UserShare* share, int64* transaction_version);
@@ skipping 15 matching lines @@
 
   // The underlying syncable object which this class wraps.
   syncable::WriteTransaction* transaction_;
 
   DISALLOW_COPY_AND_ASSIGN(WriteTransaction);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_WRITE_TRANSACTION_H_