[WebMIDI] Introduce MidiManagerUsb

media/midi/usb_midi_jack.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_JACK_H_
 #define MEDIA_MIDI_USB_MIDI_JACK_H_
 
 #include "base/basictypes.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
 class UsbMidiDevice;
 
 // UsbMidiJack represents an EMBEDDED MIDI jack.
 struct MEDIA_EXPORT UsbMidiJack {
   // The direction of the endpoint associated with an EMBEDDED MIDI jack.
   // Note that an IN MIDI jack associated with an OUT endpoint has
-  // ***OUT*** direction.
+  // ***DIRECTION_OUT*** direction.
   enum Direction {
-    IN,
-    OUT,
+    DIRECTION_IN,
+    DIRECTION_OUT,
   };
   UsbMidiJack(UsbMidiDevice* device,
               uint8 jack_id,
               uint8 cable_number,
               uint8 endpoint_address)
       : device(device),
         jack_id(jack_id),
         cable_number(cable_number),
         endpoint_address(endpoint_address) {}
   // Not owned
   UsbMidiDevice* device;
   // The id of this jack unique in the interface.
   uint8 jack_id;
   // The cable number of this jack in the associated endpoint.
   uint8 cable_number;
   // The address of the endpoint that this jack is associated with.
   uint8 endpoint_address;
 
   Direction direction() const {
-    return (endpoint_address & 0x80) ? IN : OUT;
+    return (endpoint_address & 0x80) ? DIRECTION_IN : DIRECTION_OUT;
   }
   uint8 endpoint_number() const {
     return (endpoint_address & 0xf);
   }
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MIDI_USB_MIDI_JACK_H_