[WebMIDI] Introduce MidiManagerUsb

media/midi/usb_midi_output_stream.h

 // Copyright 2014 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_USB_MIDI_OUTPUT_STREAM_H_
 #define MEDIA_MIDI_USB_MIDI_OUTPUT_STREAM_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "media/base/media_export.h"
 #include "media/midi/usb_midi_jack.h"
 
 namespace media {
 
 // UsbMidiOutputStream converts MIDI data to USB-MIDI data.
 // See "USB Device Class Definition for MIDI Devices" Release 1.0,
 // Section 4 "USB-MIDI Event Packets" for details.
 class MEDIA_EXPORT UsbMidiOutputStream {
  public:
   explicit UsbMidiOutputStream(const UsbMidiJack& jack);
 
   // Converts |data| to USB-MIDI data and send it to the jack.
   void Send(const std::vector<uint8>& data);
 
+  const UsbMidiJack& jack() const { return jack_; }
+
  private:
   size_t GetSize(const std::vector<uint8>& data) const;
   uint8_t Get(const std::vector<uint8>& data, size_t index) const;
 
   bool PushSysExMessage(const std::vector<uint8>& data,
                         size_t* current,
                         std::vector<uint8>* data_to_send);
   bool PushSysCommonMessage(const std::vector<uint8>& data,
                             size_t* current,
                             std::vector<uint8>* data_to_send);
@@ skipping 10 matching lines @@
   size_t pending_size_;
   uint8 pending_data_[kPacketContentSize];
   bool is_sending_sysex_;
 
   DISALLOW_COPY_AND_ASSIGN(UsbMidiOutputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MIDI_USB_MIDI_OUTPUT_STREAM_H_