Add Worker support for FileSystem API.

chrome/worker/webworkerclient_proxy.h

Index: chrome/worker/webworkerclient_proxy.h
diff --git a/chrome/worker/webworkerclient_proxy.h b/chrome/worker/webworkerclient_proxy.h
index 28a662ccf0da7eaa4c120c6751ba8a18c7a64141..8b196888cf3b532b34153e2f6501ed4cdbadd4b6 100644
--- a/chrome/worker/webworkerclient_proxy.h
+++ b/chrome/worker/webworkerclient_proxy.h
@@ -9,6 +9,7 @@
 #include "base/basictypes.h"
 #include "base/task.h"
 #include "ipc/ipc_channel.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebFileSystem.h"
 #include "third_party/WebKit/WebKit/chromium/public/WebWorkerClient.h"
 
 namespace WebKit {
@@ -82,6 +83,10 @@ class WebWorkerClientProxy : public WebKit::WebWorkerClient {
     return true;
   }
 
+  virtual void openFileSystem(WebKit::WebFileSystem::Type type,
+                              long long size,
+                              WebKit::WebFileSystemCallbacks* callbacks);
+
   void EnsureWorkerContextTerminates();
 
  private: