IPC: Make ChannelReader inherit from SupportsAttachmentBrokering.

ipc/ipc_channel_win.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_WIN_H_
 #define IPC_IPC_CHANNEL_WIN_H_
 
 #include "ipc/ipc_channel.h"
 
 #include <queue>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/win/scoped_handle.h"
 #include "ipc/ipc_channel_reader.h"
 
 namespace base {
 class ThreadChecker;
 }
 
 namespace IPC {
 
 class ChannelWin : public Channel,
                    public internal::ChannelReader,
                    public base::MessageLoopForIO::IOHandler {
  public:
   // Mirror methods of Channel, see ipc_channel.h for description.
-  ChannelWin(const IPC::ChannelHandle &channel_handle, Mode mode,
-             Listener* listener);
+  // |broker| must outlive the newly created object.
+  ChannelWin(const IPC::ChannelHandle& channel_handle,
+             Mode mode,
+             Listener* listener,
+             AttachmentBroker* broker);
   ~ChannelWin() 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;
 
   static bool IsNamedServerInitialized(const std::string& channel_id);
 
 
  private:
   // ChannelReader implementation.
   ReadState ReadData(char* buffer, int buffer_len, int* bytes_read) override;
   bool WillDispatchInputMessage(Message* msg) override;
@@ skipping 49 matching lines @@
 
   // This is a unique per-channel value used to authenticate the client end of
   // a connection. If the value is non-zero, the client passes it in the hello
   // and the host validates. (We don't send the zero value fto preserve IPC
   // compatability with existing clients that don't validate the channel.)
   int32 client_secret_;
 
   scoped_ptr<base::ThreadChecker> thread_check_;
   base::WeakPtrFactory<ChannelWin> weak_factory_;
 
+  // |broker_| must outlive this instance.
+  AttachmentBroker* broker_;
+
   DISALLOW_COPY_AND_ASSIGN(ChannelWin);
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_WIN_H_