Use underscores to separate words in filenames in webkitpy.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/optimize_baselines.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.
 
 import logging
 
-from webkitpy.common.checkout.baselineoptimizer import BaselineOptimizer
+from webkitpy.common.checkout.baseline_optimizer import BaselineOptimizer
 from webkitpy.layout_tests.controllers.test_result_writer import baseline_name
 from webkitpy.tool.commands.rebaseline import AbstractRebaseliningCommand
 
 
 _log = logging.getLogger(__name__)
 
 
 class OptimizeBaselines(AbstractRebaseliningCommand):
     name = "optimize-baselines"
     help_text = "Reshuffles the baselines for the given tests to use as litte space on disk as possible."
@@ skipping 20 matching lines @@
         self._baseline_suffix_list = options.suffixes.split(',')
         port_names = tool.port_factory.all_port_names(options.platform)
         if not port_names:
             _log.error("No port names match '%s'", options.platform)
             return
         port = tool.port_factory.get(port_names[0])
         optimizer = BaselineOptimizer(tool, port, port_names)
         tests = port.tests(args)
         for test_name in tests:
             self._optimize_baseline(optimizer, test_name)