Add Worker support for FileSystem API.

chrome/browser/worker_host/worker_process_host.h

Index: chrome/browser/worker_host/worker_process_host.h
diff --git a/chrome/browser/worker_host/worker_process_host.h b/chrome/browser/worker_host/worker_process_host.h
index 7845c92bcc3bd90774ee08f6c4e3ccec11f1e2da..624406bb083f5f65080e210bc5c157abc3a1807e 100644
--- a/chrome/browser/worker_host/worker_process_host.h
+++ b/chrome/browser/worker_host/worker_process_host.h
@@ -21,6 +21,7 @@ class AppCacheDispatcherHost;
 class ChromeURLRequestContext;
 class ChromeURLRequestContextGetter;
 class DatabaseDispatcherHost;
+class FileSystemDispatcherHost;
 namespace webkit_database {
 class DatabaseTracker;
 }  // namespace webkit_database
@@ -195,6 +196,7 @@ class WorkerProcessHost : public BrowserChildProcessHost {
   scoped_refptr<ChromeURLRequestContext> request_context_;
   scoped_ptr<AppCacheDispatcherHost> appcache_dispatcher_host_;
   scoped_refptr<DatabaseDispatcherHost> db_dispatcher_host_;
+  scoped_refptr<FileSystemDispatcherHost> file_system_dispatcher_host_;
 
   // A callback to create a routing id for the associated worker process.
   scoped_ptr<CallbackWithReturnValue<int>::Type> next_route_id_callback_;