Allow child processes to abort quitting.

content/common/child_thread.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 CONTENT_COMMON_CHILD_THREAD_H_
 #define CONTENT_COMMON_CHILD_THREAD_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 58 matching lines @@
 
   // Returns the one child thread.
   static ChildThread* current();
 
  protected:
   friend class ChildProcess;
 
   // Called when the process refcount is 0.
   void OnProcessFinalRelease();
 
+  // Called if the process refcount comes back from 0 before exiting.
+  void AbortProcessShutdown();
+
   virtual bool OnControlMessageReceived(const IPC::Message& msg);
   virtual void OnAskBeforeShutdown();
   virtual void OnShutdown();
 
 #ifdef IPC_MESSAGE_LOG_ENABLED
   virtual void OnSetIPCLoggingEnabled(bool enable);
 #endif
 
   IPC::SyncChannel* channel() { return channel_.get(); }
 
@@ skipping 21 matching lines @@
   scoped_ptr<ResourceDispatcher> resource_dispatcher_;
 
   // Handles SocketStream for this process.
   scoped_ptr<SocketStreamDispatcher> socket_stream_dispatcher_;
 
   // If true, checks with the browser process before shutdown.  This avoids race
   // conditions if the process refcount is 0 but there's an IPC message inflight
   // that would addref it.
   bool check_with_browser_before_shutdown_;
 
+  // If we need to check with the browser before shutdown, this keeps track of
+  // whether we still intend to shutdown by the time we hear the response.
+  bool is_waiting_to_shutdown_;
+
   // The OnChannelError() callback was invoked - the channel is dead, don't
   // attempt to communicate.
   bool on_channel_error_called_;
 
   MessageLoop* message_loop_;
 
   scoped_ptr<NotificationService> notification_service_;
 
   scoped_ptr<FileSystemDispatcher> file_system_dispatcher_;
 
   scoped_ptr<QuotaDispatcher> quota_dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildThread);
 };
 
 #endif  // CONTENT_COMMON_CHILD_THREAD_H_