[WebMIDI] Introduce UsbMidi{Input, Output}Stream.

media/media.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
     # Override to dynamically link the cras (ChromeOS audio) library.
     'use_cras%': 0,
     # Option e.g. for Linux distributions to link pulseaudio directly
@@ skipping 409 matching lines @@
         'midi/midi_message_queue.cc',
         'midi/midi_message_queue.h',
         'midi/midi_message_util.cc',
         'midi/midi_message_util.h',
         'midi/midi_manager_win.cc',
         'midi/midi_manager_win.h',
         'midi/midi_port_info.cc',
         'midi/midi_port_info.h',
         'midi/usb_midi_descriptor_parser.cc',
         'midi/usb_midi_descriptor_parser.h',
+        'midi/usb_midi_device.h',
+        'midi/usb_midi_input_stream.cc',
+        'midi/usb_midi_input_stream.h',
         'midi/usb_midi_jack.h',
+        'midi/usb_midi_output_stream.cc',
+        'midi/usb_midi_output_stream.h',
         'video/capture/android/video_capture_device_android.cc',
         'video/capture/android/video_capture_device_android.h',
         'video/capture/fake_video_capture_device.cc',
         'video/capture/fake_video_capture_device.h',
         'video/capture/file_video_capture_device.cc',
         'video/capture/file_video_capture_device.h',
         'video/capture/linux/video_capture_device_linux.cc',
         'video/capture/linux/video_capture_device_linux.h',
         'video/capture/mac/avfoundation_glue.h',
         'video/capture/mac/avfoundation_glue.mm',
@@ skipping 571 matching lines @@
         'filters/pipeline_integration_test.cc',
         'filters/pipeline_integration_test_base.cc',
         'filters/skcanvas_video_renderer_unittest.cc',
         'filters/source_buffer_stream_unittest.cc',
         'filters/video_decoder_selector_unittest.cc',
         'filters/video_frame_stream_unittest.cc',
         'filters/video_renderer_impl_unittest.cc',
         'midi/midi_message_queue_unittest.cc',
         'midi/midi_message_util_unittest.cc',
         'midi/usb_midi_descriptor_parser_unittest.cc',
+        'midi/usb_midi_input_stream_unittest.cc',
+        'midi/usb_midi_output_stream_unittest.cc',
         'video/capture/video_capture_device_unittest.cc',
         'webm/cluster_builder.cc',
         'webm/cluster_builder.h',
         'webm/tracks_builder.cc',
         'webm/tracks_builder.h',
         'webm/webm_cluster_parser_unittest.cc',
         'webm/webm_content_encodings_client_unittest.cc',
         'webm/webm_parser_unittest.cc',
         'webm/webm_tracks_parser_unittest.cc',
         'webm/webm_webvtt_parser_unittest.cc',
@@ skipping 623 matching lines @@
                   ],
                 }],
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }