Web MIDI: introduce MidiService class

media/midi/BUILD.gn

 # Copyright 2015 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
@@ skipping 70 matching lines @@
     "midi_manager.cc",
     "midi_manager.h",
     "midi_manager_mac.cc",
     "midi_manager_mac.h",
     "midi_message_queue.cc",
     "midi_message_queue.h",
     "midi_port_info.cc",
     "midi_port_info.h",
     "midi_scheduler.cc",
     "midi_scheduler.h",
+    "midi_service.cc",
+    "midi_service.h",
     "midi_switches.cc",
     "midi_switches.h",
   ]
 
   configs += [ ":midi_config" ]
 
   defines = [ "MIDI_IMPLEMENTATION" ]
   deps = [
     ":mojo",
     "//base",
@@ skipping 104 matching lines @@
     libs = [ "CoreMIDI.framework" ]
   }
 
   if (use_alsa && use_udev) {
     sources += [ "midi_manager_alsa_unittest.cc" ]
   }
 
   # This target should not require the Chrome executable to run.
   assert_no_deps = [ "//chrome" ]
 }