Use underscores to separate words in filenames in webkitpy.

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

 # Copyright (c) 2016 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 11 matching lines @@
 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 # (INCLUDING NEGLIGENCE OR/ OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 import logging
 import optparse
 
-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 AnalyzeBaselines(AbstractRebaseliningCommand):
     name = "analyze-baselines"
     help_text = "Analyzes the baselines for the given tests and prints results that are identical."
     show_in_main_help = True
@@ skipping 26 matching lines @@
         self._tool = tool
         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
         self._port = tool.port_factory.get(port_names[0])
         self._baseline_optimizer = self._optimizer_class(tool, self._port, port_names)
         for test_name in self._port.tests(args):
             self._analyze_baseline(options, test_name)