IPC: Make ChannelReader inherit from SupportsAttachmentBrokering.

ipc/ipc_channel_posix.h

 // Copyright (c) 2012 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_CHANNEL_POSIX_H_
 #define IPC_IPC_CHANNEL_POSIX_H_
 
 #include "ipc/ipc_channel.h"
 
 #include <sys/socket.h>  // for CMSG macros
 
 #include <queue>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/files/scoped_file.h"
 #include "base/message_loop/message_loop.h"
 #include "base/process/process.h"
 #include "ipc/ipc_channel_reader.h"
 #include "ipc/ipc_message_attachment_set.h"
 
 namespace IPC {
 
 class IPC_EXPORT ChannelPosix : public Channel,
                                 public internal::ChannelReader,
                                 public base::MessageLoopForIO::Watcher {
  public:
-  ChannelPosix(const IPC::ChannelHandle& channel_handle, Mode mode,
-               Listener* listener);
+  // |broker| must outlive the newly created object.
+  ChannelPosix(const IPC::ChannelHandle& channel_handle,
+               Mode mode,
+               Listener* listener,
+               AttachmentBroker* broker);
   ~ChannelPosix() override;
 
   // Channel implementation
   bool Connect() override;
   void Close() override;
   bool Send(Message* message) override;
+  AttachmentBroker* GetAttachmentBroker() override;
   base::ProcessId GetPeerPID() const override;
   base::ProcessId GetSelfPID() const override;
   int GetClientFileDescriptor() const override;
   base::ScopedFD TakeClientFileDescriptor() override;
 
   // Returns true if the channel supports listening for connections.
   bool AcceptsConnections() const;
 
   // Returns true if the channel supports listening for connections and is
   // currently connected.
@@ skipping 121 matching lines @@
 #endif
 
   // True if we are responsible for unlinking the unix domain socket file.
   bool must_unlink_;
 
 #if defined(OS_LINUX)
   // If non-zero, overrides the process ID sent in the hello message.
   static int global_pid_;
 #endif  // OS_LINUX
 
+  // |broker_| must outlive this instance.
+  AttachmentBroker* broker_;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(ChannelPosix);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_POSIX_H_