Add initial support for color output in the build system

PRESUBMIT.py

 # Copyright (c) 2011 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Documentation on PRESUBMIT.py can be found at:
 # http://www.chromium.org/developers/how-tos/depottools/presubmit-scripts
 
 import os
 import subprocess
 
@@ skipping 21 matching lines @@
 def CheckBuildbot(input_api, output_api):
   try:
     cmd = ['build_tools/partition.py', '--check']
     subprocess.check_call(cmd)
   except subprocess.CalledProcessError:
     return [output_api.PresubmitError('%s failed' % str(cmd))]
   return []
 
 
 def CheckDeps(input_api, output_api):
+  cmd = ['build_tools/python_wrapper', 'build_tools/check_deps.py']
   try:
-    subprocess.check_call(['build_tools/check_deps.py'])
+    subprocess.check_call(cmd)
   except subprocess.CalledProcessError:
-    message = 'update_mirror.py --check failed.'
-    message += '\nRun build_tools/update_mirror.py to update.'
+    message = 'check_deps.py failed.'
     return [output_api.PresubmitError(message)]
   return []
 
 
 def CheckMirror(input_api, output_api):
   try:
     subprocess.check_call(['build_tools/update_mirror.py', '--check'])
   except subprocess.CalledProcessError:
     message = 'update_mirror.py --check failed.'
     message += '\nRun build_tools/update_mirror.py to update.'
@@ skipping 52 matching lines @@
     'naclports-linux-bionic-2',
     'naclports-linux-bionic-3',
     'naclports-linux-bionic-4',
 ]
 
 
 def GetPreferredTryMasters(_, change):
   return {
     'tryserver.chromium': { t: set(['defaulttests']) for t in TRYBOTS },
   }