Detect perf regressions and speedups automatically....

factory/commands.py

Index: factory/commands.py
===================================================================
--- factory/commands.py	(revision 24874)
+++ factory/commands.py	(working copy)
@@ -331,7 +331,7 @@
   # Performance step utils.
   def _CreatePerformanceStepClass(
       self, log_processor_class, report_link=None, output_dir=None,
-      command_class=chromium_step.ProcessLogShellStep):
+      perf_name=None, command_class=chromium_step.ProcessLogShellStep):
     """Returns ProcessLogShellStep class.
 
     Args:
@@ -352,7 +352,8 @@
     # 2. Creates a unique log processor class for each individual step, so
     # they can keep state that won't be shared between builds
     log_processor_class = chromium_utils.InitializePartiallyWithArguments(
-        log_processor_class, report_link=report_link, output_dir=output_dir)
+        log_processor_class, report_link=report_link, output_dir=output_dir,
+        perf_name=perf_name)
     # Similarly, we need to allow buildbot to create the step itself without
     # using additional parameters, so we create a step class that already
     # knows which log_processor to use.
@@ -364,10 +365,12 @@
     """Selects the right build step for the specified perf test."""
     report_link = None
     output_dir = None
+    perf_name = None
     if show_results and self._target in mappings:
       mapping = mappings[self._target]
       dir_name = mapping.get(perf_id)
       if dir_name:
+        perf_name = dir_name
         report_link = "%s/%s/%s" % (self.PERF_BASE_URL, dir_name,
                                     self.PERF_REPORT_URL_SUFFIX)
         output_dir = '%s/%s/' % (self.PERF_OUTPUT_DIR, dir_name)
@@ -377,4 +380,5 @@
 
     return self._CreatePerformanceStepClass(log_processor_class,
                                             report_link=report_link,
-                                            output_dir=output_dir)
+                                            output_dir=output_dir,
+                                            perf_name=perf_name)