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

sync/engine/sync_engine_event.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_ENGINE_SYNC_ENGINE_EVENT_H_
 #define SYNC_ENGINE_SYNC_ENGINE_EVENT_H_
 
 #include <string>
 
 #include "base/observer_list.h"
+#include "sync/base/sync_export.h"
 #include "sync/internal_api/public/sessions/sync_session_snapshot.h"
 
 namespace syncable {
 class Id;
 }
 
 namespace syncer {
 
-struct SyncEngineEvent {
+struct SYNC_EXPORT_PRIVATE SyncEngineEvent {
   enum EventCause {
     ////////////////////////////////////////////////////////////////
     // Sent on entry of Syncer state machine
     SYNC_CYCLE_BEGIN,
 
     // SyncerCommand generated events.
     STATUS_CHANGED,
 
     // We have reached the SYNCER_END state in the main sync loop.
     SYNC_CYCLE_ENDED,
@@ skipping 20 matching lines @@
 
   EventCause what_happened;
 
   // The last session used for syncing.
   sessions::SyncSessionSnapshot snapshot;
 
   // Update-Client-Auth returns a new token for sync use.
   std::string updated_token;
 };
 
-class SyncEngineEventListener {
+class SYNC_EXPORT_PRIVATE SyncEngineEventListener {
  public:
   // TODO(tim): Consider splitting this up to multiple callbacks, rather than
   // have to do Event e(type); OnSyncEngineEvent(e); at all callsites,
   virtual void OnSyncEngineEvent(const SyncEngineEvent& event) = 0;
  protected:
   virtual ~SyncEngineEventListener() {}
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_SYNC_ENGINE_EVENT_H_