sync: Buffer Protocol Events for about:sync page

sync/internal_api/public/events/poll_get_updates_request_event.h

 // Copyright 2014 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_EVENTS_POLL_GET_UPDATES_REQUEST_H
 #define SYNC_INTERNAL_API_EVENTS_POLL_GET_UPDATES_REQUEST_H
 
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "base/values.h"
+#include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/events/protocol_event.h"
 #include "sync/protocol/sync.pb.h"
 
 namespace syncer {
 
 namespace sessions {
 class NudgeTracker;
 }  // namespace sessions
 
 // An event representing a poll request sent to the server.
-class PollGetUpdatesRequestEvent : public ProtocolEvent {
+class SYNC_EXPORT_PRIVATE PollGetUpdatesRequestEvent : public ProtocolEvent {
  public:
   PollGetUpdatesRequestEvent(
       base::Time timestamp,
       const sync_pb::ClientToServerMessage& request);
   virtual ~PollGetUpdatesRequestEvent();
 
   virtual base::Time GetTimestamp() const OVERRIDE;
   virtual std::string GetType() const OVERRIDE;
   virtual std::string GetDetails() const OVERRIDE;
   virtual scoped_ptr<base::DictionaryValue> GetProtoMessage() const OVERRIDE;
   virtual scoped_ptr<ProtocolEvent> Clone() const OVERRIDE;
 
  private:
   const base::Time timestamp_;
   const sync_pb::ClientToServerMessage request_;
 
   DISALLOW_COPY_AND_ASSIGN(PollGetUpdatesRequestEvent);
 };
 
 }
 
 #endif  // SYNC_INTERNAL_API_EVENTS_POLL_GET_UPDATES_REQUEST_H