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

sync/js/js_event_details.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_JS_JS_EVENT_DETAILS_H_
 #define SYNC_JS_JS_EVENT_DETAILS_H_
 
 // See README.js for design comments.
 
 #include <string>
 
 #include "base/values.h"
+#include "sync/base/sync_export.h"
 #include "sync/internal_api/public/util/immutable.h"
 
 namespace syncer {
 
 // A thin wrapper around Immutable<DictionaryValue>.  Used for passing
 // around event details to different threads.
-class JsEventDetails {
+class SYNC_EXPORT JsEventDetails {
  public:
   // Uses an empty dictionary.
   JsEventDetails();
 
   // Takes over the data in |details|, leaving |details| empty.
   explicit JsEventDetails(DictionaryValue* details);
 
   ~JsEventDetails();
 
   const DictionaryValue& Get() const;
 
   std::string ToString() const;
 
   // Copy constructor and assignment operator welcome.
 
  private:
   typedef Immutable<DictionaryValue, HasSwapMemFnByPtr<DictionaryValue> >
       ImmutableDictionaryValue;
 
   ImmutableDictionaryValue details_;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_JS_JS_EVENT_DETAILS_H_