Fix race condition with multiplexed message pipes.

mojo/edk/system/child_broker.h

 // Copyright 2015 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 MOJO_EDK_SYSTEM_CHILD_BROKER_H_
 #define MOJO_EDK_SYSTEM_CHILD_BROKER_H_
 
 #include "base/compiler_specific.h"
 #include "base/containers/hash_tables.h"
 #include "base/macros.h"
@@ skipping 52 matching lines @@
 
   // Callback for when a RoutedRawChannel is destroyed for cleanup.
   void ChannelDestructed(RoutedRawChannel* channel);
 
   // Sends a message over |parent_async_channel_|, queueing it if necessary.
   void WriteAsyncMessage(scoped_ptr<MessageInTransit> message);
 
   // Initializes |parent_async_channel_|.
   void InitAsyncChannel(ScopedPlatformHandle parent_async_channel_handle);
 
+  // Helper method to connect the given MessagePipe to the channel.
+  void AttachMessagePipe(MessagePipeDispatcher* message_pipe,
+                         uint64_t pipe_id,
+                         RoutedRawChannel* raw_channel);
+
 #if defined(OS_WIN)
   // Helper method to write the given message and read back the result.
   bool WriteAndReadResponse(BrokerMessage* message,
                             void* response,
                             uint32_t response_size);
 
   void CreatePlatformChannelPairNoLock(ScopedPlatformHandle* server,
                                        ScopedPlatformHandle* client);
 
   // Guards access to |parent_sync_channel_|.
@@ skipping 51 matching lines @@
   RoutedRawChannel* in_process_pipes_channel1_;
   RoutedRawChannel* in_process_pipes_channel2_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildBroker);
 };
 
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_CHILD_BROKER_H_