Move bisect-perf-regression.py into auto_bisect directory.

tools/auto_bisect/bisect_utils.py

 # Copyright 2014 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.
 
 """Utility functions used by the bisect tool.
 
 This includes functions related to checking out the depot and outputting
 annotations for the Buildbot waterfall.
 """
 
@@ skipping 422 matching lines @@
   """Run a git subcommand, returning its output and return code.
 
   Args:
     command: A list containing the args to git.
     cwd: A directory to change to while running the git command (optional).
 
   Returns:
     A tuple of the output and return code.
   """
   command = ['git'] + command
-
   return RunProcessAndRetrieveOutput(command, cwd=cwd)
 
 
 def CreateBisectDirectoryAndSetupDepot(opts, custom_deps):
   """Sets up a subdirectory 'bisect' and then retrieves a copy of the depot
   there using gclient.
 
   Args:
     opts: The options parsed from the command line through parse_args().
     custom_deps: A dictionary of additional dependencies to add to .gclient.
@@ skipping 119 matching lines @@
   return sys.platform.startswith('linux')
 
 
 def IsMacHost():
   """Checks whether or not the script is running on Mac.
 
   Returns:
     True if running on Mac.
   """
   return sys.platform.startswith('darwin')