Add Worker support for FileSystem API.

chrome/worker/webworker_stub_base.h

Index: chrome/worker/webworker_stub_base.h
diff --git a/chrome/worker/webworker_stub_base.h b/chrome/worker/webworker_stub_base.h
index d3d44be121dfabf8d264fd5a6a566fd4460df7fb..2ab2ac787330da7077edd80a9a95b3dfd1079cc8 100644
--- a/chrome/worker/webworker_stub_base.h
+++ b/chrome/worker/webworker_stub_base.h
@@ -6,6 +6,7 @@
 #define CHROME_WORKER_WEBWORKER_STUB_BASE_H_
 #pragma once
 
+#include "base/scoped_ptr.h"
 #include "chrome/worker/webworkerclient_proxy.h"
 #include "chrome/worker/worker_webapplicationcachehost_impl.h"
 #include "ipc/ipc_channel.h"
@@ -30,6 +31,10 @@ class WebWorkerStubBase : public IPC::Channel::Listener {
   const WorkerAppCacheInitInfo& appcache_init_info() const {
     return appcache_init_info_;
   }
+
+  // Returns the script url of this worker.
+  virtual const GURL& url() const = 0;
+
  private:
   int route_id_;
   WorkerAppCacheInitInfo appcache_init_info_;