Flapper field trial to use workerpool for sync file operations.

content/browser/renderer_host/pepper/pepper_file_message_filter.h

Index: content/browser/renderer_host/pepper/pepper_file_message_filter.h
diff --git a/content/browser/renderer_host/pepper/pepper_file_message_filter.h b/content/browser/renderer_host/pepper/pepper_file_message_filter.h
index c5065f16e35fc24a7f564423b6cc8befbcdbf087..074d6554c8a29e850fc936c8c11d66a7d97cc56d 100644
--- a/content/browser/renderer_host/pepper/pepper_file_message_filter.h
+++ b/content/browser/renderer_host/pepper/pepper_file_message_filter.h
@@ -36,6 +36,8 @@ class PepperFileMessageFilter : public content::BrowserMessageFilter {
   virtual void OverrideThreadForMessage(
       const IPC::Message& message,
       content::BrowserThread::ID* thread) OVERRIDE;
+  virtual base::TaskRunner* OverrideTaskRunnerForMessage(
+      const IPC::Message& message) OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok) OVERRIDE;
   virtual void OnDestruct() const OVERRIDE;