Make sure that the UI window created by base::MessagePumpForUI is destoyed on the same thread (Wind…

base/message_loop/message_pump.h

Index: base/message_loop/message_pump.h
diff --git a/base/message_loop/message_pump.h b/base/message_loop/message_pump.h
index 5b722321495240db85ba80a943a1b7b0efe5c332..a59d71bf7b3001312642d7dbee57cb1dd62fc701 100644
--- a/base/message_loop/message_pump.h
+++ b/base/message_loop/message_pump.h
@@ -119,6 +119,12 @@ class BASE_EXPORT MessagePump : public RefCountedThreadSafe<MessagePump> {
   // used on the thread that called Run.
   virtual void ScheduleDelayedWork(const TimeTicks& delayed_work_time) = 0;
 
+  // Stops the pump after exiting the last run loop. This method must be used on
+  // the same thread that called Run(). The method frees any resources
+  // affinitized to that thread because ~MessagePump() might be invoked on an
+  // arbitrary thread.
+  virtual void Shutdown() = 0;
+
  protected:
   virtual ~MessagePump();
   friend class RefCountedThreadSafe<MessagePump>;