Change SDK builder bot to use sysroots when compiling

tools/bots/bot.py

 #!/usr/bin/python
 
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """
 Shared code for use in the buildbot scripts.
 """
 
@@ skipping 253 matching lines @@
       os.path.join('third_party', 'pkg', 'test', 'bin', 'test.dart'))
 
   with utils.ChangedWorkingDirectory(path):
     args = [dart_bin, '--package-root=' + package_root, test_bin,
             '--package-root', package_root, '--reporter', 'expanded',
             '--no-color']
     print("Running %s" % ' '.join(args))
     RunProcess(args)
 
 
-def RunProcess(command):
+def RunProcess(command, env=None):
   """
   Runs command.
 
   If a non-zero exit code is returned, raises an OSError with errno as the exit
   code.
   """
-  no_color_env = dict(os.environ)
+  if env is None:
+    no_color_env = dict(os.environ)
+  else:
+    no_color_env = env
   no_color_env['TERM'] = 'nocolor'
 
   exit_code = subprocess.call(command, env=no_color_env)
   if exit_code != 0:
     raise OSError(exit_code)
 
 
 def GetStepName(name, flags):
   """
   Filters out flags with '=' as this breaks the /stats feature of the buildbot.
   """
   flags = [x for x in flags if not '=' in x]
   return ('%s tests %s' % (name, ' '.join(flags))).strip()