Web MIDI: MidiManager crashes if a session is ended while initializing

media/midi/midi_manager.h

 // Copyright (c) 2013 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 MEDIA_MIDI_MIDI_MANAGER_H_
 #define MEDIA_MIDI_MIDI_MANAGER_H_
 
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 134 matching lines @@
   }
 
  private:
   void CompleteInitializationInternal(MidiResult result);
 
   // Keeps track of all clients who wish to receive MIDI data.
   typedef std::set<MidiManagerClient*> ClientList;
   ClientList clients_;
 
   // Keeps track of all clients who are waiting for CompleteStartSession().
-  typedef std::map<int, MidiManagerClient*> PendingClientMap;
+  typedef std::multimap<MidiManagerClient*, int> PendingClientMap;
   PendingClientMap pending_clients_;
 
   // Keeps a SingleThreadTaskRunner of the thread that calls StartSession in
   // order to invoke CompleteStartSession() on the thread.
   scoped_refptr<base::SingleThreadTaskRunner> session_thread_runner_;
 
   // Keeps true if platform dependent initialization is already completed.
   bool initialized_;
 
   // Keeps the platform dependent initialization result if initialization is
   // completed. Otherwise keeps MIDI_NOT_SUPPORTED.
   MidiResult result_;
 
   // Protects access to |clients_|, |pending_clients_|, |initialized_|, and
   // |result_|.
   base::Lock lock_;
 
   MidiPortInfoList input_ports_;
   MidiPortInfoList output_ports_;
 
   DISALLOW_COPY_AND_ASSIGN(MidiManager);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MIDI_MIDI_MANAGER_H_