Test extension reloading behavior.

ipc/ipc_test_sink.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 IPC_IPC_TEST_SINK_H_
 #define IPC_IPC_TEST_SINK_H_
 
 #include <utility>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/observer_list.h"
 #include "ipc/ipc_channel.h"
+#include "ipc/ipc_listener.h"
 
 namespace IPC {
 
 class Message;
 
 // This test sink provides a "sink" for IPC messages that are sent. It allows
 // the caller to query messages received in various different ways.  It is
 // designed for tests for objects that use the IPC system.
 //
 // Typical usage:
@@ skipping 39 matching lines @@
 //
 //   MyListener listener;
 //   test_sink.AddFilter(&listener);
 //   StartSomeAsynchronousProcess(&test_sink);
 //   MessageLoop::current()->Run();
 //   <inspect the results>
 //   ...
 //
 // To hook up the sink, all you need to do is call OnMessageReceived when a
 // message is received.
-class TestSink : public Channel {
+class TestSink : public Channel, public Listener {

[Jeffrey Yasskin, 2013/04/04 09:34:35]

This allows chaining TestSinks. 

  public:
   TestSink();
   virtual ~TestSink();
 
   // Interface in IPC::Channel. This copies the message to the sink and then
   // deletes it.
   virtual bool Send(IPC::Message* message) OVERRIDE;
 
   // Used by the source of the messages to send the message to the sink. This
   // will make a copy of the message and store it in the list.
-  bool OnMessageReceived(const Message& msg);
+  virtual bool OnMessageReceived(const Message& msg) OVERRIDE;
 
   // Returns the number of messages in the queue.
   size_t message_count() const { return messages_.size(); }
 
   // Clears the message queue of saved messages.
   void ClearMessages();
 
   // Returns the message at the given index in the queue. The index may be out
   // of range, in which case the return value is NULL. The returned pointer will
   // only be valid until another message is received or the list is cleared.
@@ skipping 25 matching lines @@
   // The actual list of received messages.
   std::vector<Message> messages_;
   ObserverList<Listener> filter_list_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSink);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_TEST_SINK_H_