Ensure manifest exists in Port._wpt_manifest.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/rebaseline_cl.py

 # Copyright 2016 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.
 
 """A command to fetch new baselines from try jobs for the current CL."""
 
 import json
 import logging
 import optparse
 
 from webkitpy.common.net.git_cl import GitCL
 from webkitpy.layout_tests.models.test_expectations import BASELINE_SUFFIX_LIST
 from webkitpy.tool.commands.rebaseline import AbstractParallelRebaselineCommand
+from webkitpy.w3c.wpt_manifest import WPTManifest
 
 _log = logging.getLogger(__name__)
 
 
 class RebaselineCL(AbstractParallelRebaselineCommand):
     name = "rebaseline-cl"
     help_text = "Fetches new baselines for a CL from test runs on try bots."
     long_help = ("By default, this command will check the latest try job results "
                  "for all platforms, and start try jobs for platforms with no "
                  "try jobs. Then, new baselines are downloaded for any tests "
@@ skipping 12 matching lines @@
             optparse.make_option(
                 '--no-trigger-jobs', dest='trigger_jobs', action='store_false', default=True,
                 help='Do not trigger any try jobs.'),
             self.no_optimize_option,
             self.results_directory_option,
         ])
 
     def execute(self, options, args, tool):
         self._tool = tool
 
+        # TODO(qyearsley): Move this call to somewhere else.
+        WPTManifest.ensure_manifest(tool)
+
         unstaged_baselines = self.unstaged_baselines()
         if unstaged_baselines:
             _log.error('Aborting: there are unstaged baselines:')
             for path in unstaged_baselines:
                 _log.error('  %s', path)
             return 1
 
         issue_number = self._get_issue_number()
         if not issue_number:
             return 1
@@ skipping 165 matching lines @@
     def _log_test_prefix_list(test_prefix_list):
         """Logs the tests to download new baselines for."""
         if not test_prefix_list:
             _log.info('No tests to rebaseline; exiting.')
             return
         _log.debug('Tests to rebaseline:')
         for test, builds in test_prefix_list.iteritems():
             _log.debug('  %s:', test)
             for build in sorted(builds):
                 _log.debug('    %s', build)