chromium_build_stats: fix trace viewer

appengine/chromium_build_stats/default/ninja_log.go

 // 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.
 
 package chromiumbuildstats
 
 // ninja_log.go provides /ninja_log endpoints.
 
 import (
         "bufio"
@@ skipping 95 matching lines @@
  <td>{{$step.Out}}
 </tr>
 {{end}}
 </table>
 </html>
 `))
 
         traceViewerTmpl = traceviewer.Must(traceviewer.Parse("tmpl/trace-viewer.html"))
 )
 
+//go:generate ../../third_party/catapult/tracing/bin/trace2html tmpl/dummy.json --output=tmpl/trace-viewer.html
+
 func init() {
         http.Handle("/ninja_log/", http.StripPrefix("/ninja_log/", http.HandlerFunc(ninjaLogHandler)))
 }
 
 // ninjaLogHandler handles /<path>/<format> for ninja_log file in gs://chrome-goma-log/<path>
 func ninjaLogHandler(w http.ResponseWriter, req *http.Request) {
         if req.URL.Path == "" {
                 ninjalogForm(w, req)
                 return
         }
@@ skipping 198 matching lines @@
         traces := ninjalog.ToTraces(flow, 1)
         b, err := traceViewerTmpl.HTML(logPath, traces)
         if err != nil {
                 return err
         }
         w.Header().Set("Content-Type", "text/html; charset=utf-8")
         w.WriteHeader(http.StatusOK)
         _, err = w.Write(b)
         return err
 }