ServiceWorker: Create sequenced task runner for database

content/browser/service_worker/service_worker_storage.h

Index: content/browser/service_worker/service_worker_storage.h
diff --git a/content/browser/service_worker/service_worker_storage.h b/content/browser/service_worker/service_worker_storage.h
index 3932a72c525613708eea934084cc0f643989241a..ee524e0574a55b09ae097abca7d75dbc463b629d 100644
--- a/content/browser/service_worker/service_worker_storage.h
+++ b/content/browser/service_worker/service_worker_storage.h
@@ -18,6 +18,10 @@
 #include "content/common/service_worker/service_worker_status_code.h"
 #include "url/gurl.h"
 
+namespace base {
+class SequencedTaskRunner;
+}
+
 namespace quota {
 class QuotaManagerProxy;
 }
@@ -46,6 +50,7 @@ class CONTENT_EXPORT ServiceWorkerStorage {
 
   ServiceWorkerStorage(const base::FilePath& path,
                        base::WeakPtr<ServiceWorkerContextCore> context,
+                       base::SequencedTaskRunner* database_task_runner,
                        quota::QuotaManagerProxy* quota_manager_proxy);
   ~ServiceWorkerStorage();
 
@@ -137,6 +142,7 @@ class CONTENT_EXPORT ServiceWorkerStorage {
 
   base::FilePath path_;
   base::WeakPtr<ServiceWorkerContextCore> context_;
+  scoped_refptr<base::SequencedTaskRunner> database_task_runner_;
   scoped_refptr<quota::QuotaManagerProxy> quota_manager_proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerStorage);