Split GenerateBenchGraphs into three build steps

slave/skia_slave_scripts/generate_bench_graphs.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """ Generate performance graphs from bench output. """
 
 from build_step import BuildStep
 from utils import bench_common
 from utils import shell_utils
@@ skipping 17 matching lines @@
       os.makedirs(self._perf_graphs_dir)
     except OSError as e:
       if e.errno == errno.EEXIST:
         pass
       else:
         raise e
     dest_gsbase = (self._args.get('dest_gsbase') or
                    sync_bucket_subdir.DEFAULT_PERFDATA_GS_BASE)
 
     path_to_bench_graph_svg = os.path.join('bench', 'bench_graph_svg.py')
-    path_to_bench_expectations = os.path.join('bench',
-                                              'bench_expectations.txt')
     graph_title = 'Bench_Performance_for_%s' % self._builder_name
     graph_filepath = bench_common.GraphFilePath(self._perf_graphs_dir,
                                                 self._builder_name,
                                                 representation)
     sync_bucket_subdir.SyncBucketSubdir(directory=self._perf_data_dir,
         dest_gsbase=dest_gsbase,
         subdir=posixpath.join('perfdata', self._builder_name),
         do_upload=False,
         do_download=True,
         min_download_revision=self._got_revision -
             bench_common.BENCH_GRAPH_NUM_REVISIONS)
 
     cmd = ['python', path_to_bench_graph_svg,
            '-d', self._perf_data_dir,
-           '-e', path_to_bench_expectations,
            '-r', '-%d' % bench_common.BENCH_GRAPH_NUM_REVISIONS,
            '-f', '-%d' % bench_common.BENCH_GRAPH_NUM_REVISIONS,
            '-x', '%d' % bench_common.BENCH_GRAPH_X,
            '-y', '%d' % bench_common.BENCH_GRAPH_Y,
            '-l', graph_title,
            '-m', representation,
            '-o', graph_filepath,
            ]
     if self._builder_name.find('_Win') >= 0:
       cmd.extend(['-i', 'c'])  # Ignore cpu time for Windows.
 
     shell_utils.Bash(cmd)
 
   def _Run(self):
     if self._perf_data_dir:
       for rep in ['avg', 'min', 'med', '25th']:
         self._RunInternal(rep)
 
 
 if '__main__' == __name__:
   sys.exit(BuildStep.RunBuildStep(GenerateBenchGraphs))