Add a base class for objects that want to filter messages on the UI thread. ...

ipc/ipc_sync_channel.h

 // Copyright (c) 2010 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_SYNC_SENDER_H__
 #define IPC_IPC_SYNC_SENDER_H__
 #pragma once
 
 #include <string>
 #include <deque>
@@ skipping 16 matching lines @@
 
 // This is similar to ChannelProxy, with the added feature of supporting sending
 // synchronous messages.
 // Note that care must be taken that the lifetime of the ipc_thread argument
 // is more than this object.  If the message loop goes away while this object
 // is running and it's used to send a message, then it will use the invalid
 // message loop pointer to proxy it to the ipc thread.
 class SyncChannel : public ChannelProxy,
                     public base::WaitableEventWatcher::Delegate {
  public:
-  SyncChannel(const std::string& channel_id, Channel::Mode mode,
-              Channel::Listener* listener, MessageFilter* filter,
-              MessageLoop* ipc_message_loop, bool create_pipe_now,
+  SyncChannel(const std::string& channel_id,
+              Channel::Mode mode,
+              Channel::Listener* listener,
+              MessageLoop* ipc_message_loop,
+              bool create_pipe_now,
               base::WaitableEvent* shutdown_event);
   virtual ~SyncChannel();
 
   virtual bool Send(Message* message);
   virtual bool SendWithTimeout(Message* message, int timeout_ms);
 
   // Whether we allow sending messages with no time-out.
   void set_sync_messages_with_no_timeout_allowed(bool value) {
     sync_messages_with_no_timeout_allowed_ = value;
   }
 
  protected:
   class ReceivedSyncMsgQueue;
   friend class ReceivedSyncMsgQueue;
 
   // SyncContext holds the per object data for SyncChannel, so that SyncChannel
   // can be deleted while it's being used in a different thread.  See
   // ChannelProxy::Context for more information.
   class SyncContext : public Context,
                       public base::WaitableEventWatcher::Delegate {
    public:
     SyncContext(Channel::Listener* listener,
-                MessageFilter* filter,
                 MessageLoop* ipc_thread,
                 base::WaitableEvent* shutdown_event);
 
     // Adds information about an outgoing sync message to the context so that
     // we know how to deserialize the reply.
     void Push(SyncMessage* sync_msg);
 
     // Cleanly remove the top deserializer (and throw it away).  Returns the
     // result of the Send call for that message.
     bool Pop();
@@ skipping 73 matching lines @@
 
   // Used to signal events between the IPC and listener threads.
   base::WaitableEventWatcher dispatch_watcher_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncChannel);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_SYNC_SENDER_H__