Increase run_benchmarks timeout because the two Chromium page sets can take a while

tools/skp/webpages_playback.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Archives or replays webpages and creates SKPs in a Google Storage location.
 
 To archive webpages and store SKP files (archives should be rarely updated):
 
 cd skia
@@ skipping 272 matching lines @@
           # break out of the loop.
           raise Exception('record_wpr failed for page_set: %s' % page_set)
 
       else:
         # Get the webpages archive so that it can be replayed.
         self._DownloadWebpagesArchive(wpr_data_file, page_set_json_name)
 
       run_benchmark_cmd = (
           'PYTHONPATH=%s:%s:$PYTHONPATH' % (page_set_dir, self._catapult_dir),
           'DISPLAY=%s' % X11_DISPLAY,
-          'timeout', '300',
+          'timeout', '600',
           os.path.join(self._telemetry_binaries_dir, 'run_benchmark'),
           '--extra-browser-args="%s"' % self._browser_args,
           '--browser=exact',
           '--browser-executable=%s' % self._browser_executable,
           SKP_BENCHMARK,
           '--page-set-name=%s' % page_set_basename,
           '--page-set-base-dir=%s' % page_set_dir,
           '--skp-outdir=%s' % TMP_SKP_DIR,
           '--also-run-disabled-tests'
       )
@@ skipping 289 matching lines @@
            '--skia_tools is specified then the debugger is not run.',
       default=False)
   option_parser.add_option(
       '', '--skp_prefix',
       help='Prefix to add to the names of generated SKPs.',
       default=None)
   options, unused_args = option_parser.parse_args()
 
   playback = SkPicturePlayback(options)
   sys.exit(playback.Run())