Add the beginning of a public Service Worker API.

content/public/common/service_worker_status_code.h

Index: content/public/common/service_worker_status_code.h
diff --git a/content/common/service_worker/service_worker_status_code.h b/content/public/common/service_worker_status_code.h
similarity index 87%
rename from content/common/service_worker/service_worker_status_code.h
rename to content/public/common/service_worker_status_code.h
index a0245e48e10feabbe48edc800c6badbea8adfbc4..523170a1b3208ad0ef9103f43dee1eb8a3f6a6f7 100644
--- a/content/common/service_worker/service_worker_status_code.h
+++ b/content/public/common/service_worker_status_code.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CONTENT_COMMON_SERVICE_WORKER_SERVICE_WORKER_STATUS_CODE_H_
-#define CONTENT_COMMON_SERVICE_WORKER_SERVICE_WORKER_STATUS_CODE_H_
+#ifndef CONTENT_PUBLIC_COMMON_SERVICE_WORKER_STATUS_CODE_H_
+#define CONTENT_PUBLIC_COMMON_SERVICE_WORKER_STATUS_CODE_H_
 
 #include "content/common/content_export.h"
 
@@ -49,4 +49,4 @@ CONTENT_EXPORT const char* ServiceWorkerStatusToString(
 
 }  // namespace content
 
-#endif  // CONTENT_COMMON_SERVICE_WORKER_SERVICE_WORKER_STATUS_CODE_H_
+#endif  // CONTENT_PUBLIC_COMMON_SERVICE_WORKER_STATUS_CODE_H_