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

sync/js/js_controller.h

Index: sync/js/js_controller.h
diff --git a/sync/js/js_controller.h b/sync/js/js_controller.h
index c2a547509ca7e6d0aa37a5513fdfd11751dd563c..08432bf004e62a3f2063a082d8bc37da8c0f97e2 100644
--- a/sync/js/js_controller.h
+++ b/sync/js/js_controller.h
@@ -1,4 +1,4 @@
-// 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.
 
@@ -9,6 +9,8 @@
 
 #include <string>
 
+#include "sync/base/sync_export.h"
+
 namespace syncer {
 
 class JsArgList;
@@ -19,7 +21,7 @@ template <typename T> class WeakHandle;
 // An interface for objects that JsEventHandlers directly interact
 // with.  JsEventHandlers can add themselves to receive events and
 // also send messages which will eventually reach the backend.
-class JsController {
+class SYNC_EXPORT JsController {
  public:
   // Adds an event handler which will start receiving JS events (not
   // immediately, so this can be called in the handler's constructor).