Change MessagePumpLibevent::Run to process I/O events before doing idle

base/message_pump_libevent.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_MESSAGE_PUMP_LIBEVENT_H_
 #define BASE_MESSAGE_PUMP_LIBEVENT_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/message_pump.h"
@@ skipping 126 matching lines @@
   // Unix pipe used to implement ScheduleWork()
   // ... callback; called by libevent inside Run() when pipe is ready to read
   static void OnWakeup(int socket, short flags, void* context);
 
   // This flag is set to false when Run should return.
   bool keep_running_;
 
   // This flag is set when inside Run.
   bool in_run_;
 
+  // This flag is set if libevent has processed I/O events.
+  bool processed_io_events_;
+
   // The time at which we should call DoDelayedWork.
   TimeTicks delayed_work_time_;
 
   // Libevent dispatcher.  Watches all sockets registered with it, and sends
   // readiness callbacks when a socket is ready for I/O.
   event_base* event_base_;
 
   // ... write end; ScheduleWork() writes a single byte to it
   int wakeup_pipe_in_;
   // ... read end; OnWakeup reads it and then breaks Run() out of its sleep
   int wakeup_pipe_out_;
   // ... libevent wrapper for read end
   event* wakeup_event_;
 
   ObserverList<IOObserver> io_observers_;
   ThreadChecker watch_file_descriptor_caller_checker_;
   DISALLOW_COPY_AND_ASSIGN(MessagePumpLibevent);
 };
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_PUMP_LIBEVENT_H_