Check that Diagnostic subclasses are registered in presubmit.

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/list_view.css',
       'tracing/ui/extras/about_tracing/common.css',
       'tracing/ui/extras/chrome/cc/display_item_list_view.css',
@@ skipping 502 matching lines @@
       'tracing/ui/tracks/sample_track.html',
       'tracing/ui/tracks/slice_group_track.html',
       'tracing/ui/tracks/slice_track.html',
       'tracing/ui/tracks/spacing_track.html',
       'tracing/ui/tracks/stacked_bars_track.html',
       'tracing/ui/tracks/thread_track.html',
       'tracing/ui/tracks/track.html',
       'tracing/ui/tracks/x_axis_track.html',
       'tracing/ui/view_specific_brushing_state.html',
       'tracing/value/csv_builder.html',
+      'tracing/value/diagnostics/all_diagnostics.html',
       'tracing/value/diagnostics/breakdown.html',
       'tracing/value/diagnostics/buildbot_info.html',
       'tracing/value/diagnostics/collected_generic.html',
       'tracing/value/diagnostics/collected_related_event_set.html',
       'tracing/value/diagnostics/device_info.html',
       'tracing/value/diagnostics/diagnostic.html',
       'tracing/value/diagnostics/diagnostic_map.html',
       'tracing/value/diagnostics/diagnostic_ref.html',
       'tracing/value/diagnostics/event_ref.html',
       'tracing/value/diagnostics/generic.html',
       'tracing/value/diagnostics/grouping_path.html',
       'tracing/value/diagnostics/histogram_ref.html',
       'tracing/value/diagnostics/merged_buildbot_info.html',
       'tracing/value/diagnostics/merged_device_info.html',
       'tracing/value/diagnostics/merged_revision_info.html',
       'tracing/value/diagnostics/merged_telemetry_info.html',
+      'tracing/value/diagnostics/ownership.html',
       'tracing/value/diagnostics/related_event_set.html',
       'tracing/value/diagnostics/related_histogram_breakdown.html',
       'tracing/value/diagnostics/related_histogram_map.html',
       'tracing/value/diagnostics/related_histogram_set.html',
       'tracing/value/diagnostics/revision_info.html',
       'tracing/value/diagnostics/scalar.html',
       'tracing/value/diagnostics/tag_map.html',
       'tracing/value/diagnostics/telemetry_info.html',
       'tracing/value/diagnostics/unmergeable_diagnostic_set.html',
       'tracing/value/histogram.html',
@@ skipping 39 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)',
     ],
   }
 }