Web MIDI: add MidiScheduler for send() with timestamp

media/BUILD.gn

 # 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/features.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
@@ skipping 175 matching lines @@
     "midi/midi_manager_usb.cc",
     "midi/midi_manager_usb.h",
     "midi/midi_manager_win.cc",
     "midi/midi_manager_win.h",
     "midi/midi_message_queue.cc",
     "midi/midi_message_queue.h",
     "midi/midi_message_util.cc",
     "midi/midi_message_util.h",
     "midi/midi_port_info.cc",
     "midi/midi_port_info.h",
+    "midi/midi_scheduler.cc",
+    "midi/midi_scheduler.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",
     "renderers/audio_renderer_impl.cc",
     "renderers/audio_renderer_impl.h",
@@ skipping 608 matching lines @@
       ":media",
       ":shared_memory_support",
       "//base",
       "//tools/xdisplaycheck",
       "//ui/gl",
       "//ui/gfx",
       "//ui/gfx/geometry",
     ]
   }
 }