[sync] Componentize sync: Part 6: Add more SYNC_EXPORTs to files in src/sync/

sync/notifier/invalidation_handler.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_NOTIFIER_INVALIDATION_HANDLER_H_
 #define SYNC_NOTIFIER_INVALIDATION_HANDLER_H_
 
+#include "sync/base/sync_export.h"
 #include "sync/notifier/invalidator_state.h"
 #include "sync/notifier/object_id_invalidation_map.h"
 
 namespace syncer {
 
 enum IncomingInvalidationSource {
   // The server is notifying us that one or more objects have stale data.
   REMOTE_INVALIDATION,
   // Something locally is requesting an optimistic refresh of its data.
   LOCAL_INVALIDATION,
 };
 
-class InvalidationHandler {
+class SYNC_EXPORT InvalidationHandler {
  public:
   // Called when the invalidator state changes.
   virtual void OnInvalidatorStateChange(InvalidatorState state) = 0;
 
   // Called when a invalidation is received.  The per-id states are in
   // |id_state_map| and the source is in |source|.  Note that this may be
   // called regardless of the current invalidator state.
   virtual void OnIncomingInvalidation(
       const ObjectIdInvalidationMap& invalidation_map,
       IncomingInvalidationSource source) = 0;
 
  protected:
   virtual ~InvalidationHandler() {}
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_NOTIFIER_INVALIDATION_HANDLER_H_