Detect perf regressions and speedups automatically....

chromium_step.py

 #!/usr/bin/python
 # Copyright (c) 2006-2008 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.
 
 """Subclasses of various slave command classes."""
 
 import copy
 import os
 
@@ skipping 106 matching lines @@
         self._GetRevision(), self.getLog('stdio').getText())
 
   def getText(self, cmd, results):
     text_list = self.describe(True)
     if self._result_text:
       self._result_text.insert(0, '<div class="BuildResultInfo">')
       self._result_text.append('</div>')
       text_list = text_list + self._result_text
     return text_list
 
+  def evaluateCommand(self, cmd):
+    # If the log processor provides a facility to evaluate its performance,
+    # call it.
+    if self._log_processor and self._log_processor.evaluateCommand:
+      return self._log_processor.evaluateCommand(cmd)
+
+    # Otherwise, report success by default.
+    return builder.SUCCESS
+
   def _CreateReportLinkIfNeccessary(self):
     if self._log_processor.ReportLink():
       self.addURL('results', "%s" % self._log_processor.ReportLink())