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

sync/js/js_arg_list.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_ARG_LIST_H_
 #define SYNC_JS_JS_ARG_LIST_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<ListValue>.  Used for passing
 // around argument lists to different threads.
-class JsArgList {
+class SYNC_EXPORT JsArgList {
  public:
   // Uses an empty argument list.
   JsArgList();
 
   // Takes over the data in |args|, leaving |args| empty.
   explicit JsArgList(ListValue* args);
 
   ~JsArgList();
 
   const ListValue& Get() const;
 
   std::string ToString() const;
 
   // Copy constructor and assignment operator welcome.
 
  private:
   typedef Immutable<ListValue, HasSwapMemFnByPtr<ListValue> >
       ImmutableListValue;
   ImmutableListValue args_;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_JS_JS_ARG_LIST_H_