Detect perf regressions and speedups automatically....

factory/chromium_commands.py

Index: factory/chromium_commands.py
===================================================================
--- factory/chromium_commands.py	(revision 24874)
+++ factory/chromium_commands.py	(working copy)
@@ -405,12 +405,14 @@
     """Selects the right build step for the specified page-cycler test."""
     report_link = None
     output_dir = None
+    perf_name = None
     if show_results and self._target in self.PAGECYCLER_TEST_MAPPINGS:
       mapping = self.PAGECYCLER_TEST_MAPPINGS[self._target]
       dir_name = mapping.get(perf_id)
       if dir_name:
         if http:
           test_name += '-http'
+        perf_name = '%s/%s' % (dir_name, test_name)
         report_link = (self.PERF_BASE_URL +
                        '/%s/%s/' % (dir_name, test_name) +
                        self.PERF_REPORT_URL_SUFFIX)
@@ -422,7 +424,8 @@
     return self._CreatePerformanceStepClass(
         process_log.GraphingPageCyclerLogProcessor,
         report_link=report_link,
-        output_dir=output_dir)
+        output_dir=output_dir,
+        perf_name=perf_name)
 
   def GetPageCyclerCommand(self, test_name, http):
     """Returns a command list to call the _test_tool on the page_cycler