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

sync/util/extensions_activity_monitor.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_UTIL_EXTENSIONS_ACTIVITY_MONITOR_H_
 #define SYNC_UTIL_EXTENSIONS_ACTIVITY_MONITOR_H_
 
 #include <map>
 #include <string>
 
 #include "base/basictypes.h"
+#include "sync/base/sync_export.h"
 
 namespace syncer {
 
 // An interface to monitor usage of extensions APIs to send to sync
 // servers, with the ability to purge data once sync servers have
 // acknowledged it (successful commit response).
 //
 // All abstract methods are called from the sync thread.
-class ExtensionsActivityMonitor {
+class SYNC_EXPORT ExtensionsActivityMonitor {
  public:
   // A data record of activity performed by extension |extension_id|.
-  struct Record {
+  struct SYNC_EXPORT Record {
     Record();
     ~Record();
 
     // The human-readable ID identifying the extension responsible
     // for the activity reported in this Record.
     std::string extension_id;
 
     // How many times the extension successfully invoked a write
     // operation through the bookmarks API since the last CommitMessage.
     uint32 bookmark_write_count;
   };
 
   typedef std::map<std::string, Record> Records;
 
   // Fill |buffer| with all current records and then clear the
   // internal records.
   virtual void GetAndClearRecords(Records* buffer) = 0;
 
   // Merge |records| with the current set of records, adding the
   // bookmark write counts for common Records.
   virtual void PutRecords(const Records& records) = 0;
 
  protected:
   virtual ~ExtensionsActivityMonitor();
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_UTIL_EXTENSIONS_ACTIVITY_MONITOR_H_