Include scheduling-only threads in tracks

tracing/trace_viewer.gypi

 # Copyright (c) 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.
 
 {
   'variables': {
     'tracing_css_files': [
       'tracing/ui/base/line_chart.css',
       'tracing/ui/base/list_view.css',
       'tracing/ui/base/pie_chart.css',
@@ skipping 459 matching lines @@
       'tracing/ui/tracks/global_memory_dump_track.html',
       'tracing/ui/tracks/highlighter.html',
       'tracing/ui/tracks/interaction_track.html',
       'tracing/ui/tracks/kernel_track.html',
       'tracing/ui/tracks/letter_dot_track.html',
       'tracing/ui/tracks/memory_dump_track_util.html',
       'tracing/ui/tracks/model_track.html',
       'tracing/ui/tracks/multi_row_track.html',
       'tracing/ui/tracks/object_instance_group_track.html',
       'tracing/ui/tracks/object_instance_track.html',
+      'tracing/ui/tracks/other_threads_track.html',
       'tracing/ui/tracks/power_series_track.html',
       'tracing/ui/tracks/process_memory_dump_track.html',
       'tracing/ui/tracks/process_summary_track.html',
       'tracing/ui/tracks/process_track.html',
       'tracing/ui/tracks/process_track_base.html',
       'tracing/ui/tracks/rect_track.html',
       'tracing/ui/tracks/ruler_track.html',
       'tracing/ui/tracks/sample_track.html',
       'tracing/ui/tracks/slice_group_track.html',
       'tracing/ui/tracks/slice_track.html',
@@ skipping 45 matching lines @@
       'tracing/ui/images/chrome-right.png',
       'tracing/ui/images/ui-states.png',
     ],
     'tracing_files': [
       '<@(tracing_css_files)',
       '<@(tracing_js_html_files)',
       '<@(tracing_img_files)',
     ],
   }
 }