Web MIDI: introduce pending client count limit to start sessions

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 37 matching lines @@
   // AccumulateMidiBytesSent() is called to acknowledge when bytes have
   // successfully been sent to the hardware.
   // This happens as a result of the client having previously called
   // MidiManager::DispatchSendMidiData().
   virtual void AccumulateMidiBytesSent(size_t n) = 0;
 };
 
 // Manages access to all MIDI hardware.
 class MEDIA_EXPORT MidiManager {
  public:
+  static const size_t kMaxPendingClientCount = 128;
+
+  MidiManager();
+  virtual ~MidiManager();
+
   // The constructor and the destructor will be called on the CrBrowserMain
   // thread.
   static MidiManager* Create();
 
-  MidiManager();
-  virtual ~MidiManager();
-
   // A client calls StartSession() to receive and send MIDI data.
   // If the session is ready to start, the MIDI system is lazily initialized
   // and the client is registered to receive MIDI data.
   // CompleteStartSession() is called with MIDI_OK if the session is started.
   // Otherwise CompleteStartSession() is called with proper MidiResult code.
   // StartSession() and EndSession() can be called on the Chrome_IOThread.
   // CompleteStartSession() will be invoked on the same Chrome_IOThread.
   void StartSession(MidiManagerClient* client, int client_id);
 
   // A client calls EndSession() to stop receiving MIDI data.
@@ skipping 96 matching lines @@
   // Protects access to |clients_|, |pending_clients_|, |initialized_|, and
   // |result_|.
   base::Lock lock_;
 
   DISALLOW_COPY_AND_ASSIGN(MidiManager);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MIDI_MIDI_MANAGER_H_