Fixing crash on chrome profiler on generating html trace.

tools/profile_chrome/trace_packager.py

 # 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 codecs
 import gzip
 import json
 import os
 import shutil
 import sys
 import zipfile
 
 from profile_chrome import util
 
 from pylib import constants
 
 sys.path.append(os.path.join(constants.DIR_SOURCE_ROOT,
                              'third_party',
                              'trace-viewer'))
 # pylint: disable=F0401
 from trace_viewer.build import trace2html
 
 
 def _PackageTracesAsHtml(trace_files, html_file):
-  with open(html_file, 'w') as f:
+  with codecs.open(html_file, mode='w', encoding='utf-8') as f:
     trace2html.WriteHTMLForTracesToFile(trace_files, f)
   for trace_file in trace_files:
     os.unlink(trace_file)
 
 
 def _CompressFile(host_file, output):
   with gzip.open(output, 'wb') as out, \
       open(host_file, 'rb') as input_file:
     out.write(input_file.read())
   os.unlink(host_file)
@@ skipping 50 matching lines @@
     _CompressFile(trace_files[0], result)
   elif len(trace_files) > 1:
     result = output or 'chrome-combined-trace-%s.zip' % util.GetTraceTimestamp()
     _ArchiveFiles(trace_files, result)
   elif output:
     result = output
     shutil.move(trace_files[0], result)
   else:
     result = trace_files[0]
   return result