[chromedriver] Clean tmp directory and kill Chrome processes before each run cycle.

chrome/test/chromedriver/run_buildbot_steps.py

Index: chrome/test/chromedriver/run_buildbot_steps.py
diff --git a/chrome/test/chromedriver/run_buildbot_steps.py b/chrome/test/chromedriver/run_buildbot_steps.py
index 87f560036e795eaf47dff7abf60ed2bfd573b886..f9b8edf54a6e34382512527fb4f7117ed0335924 100755
--- a/chrome/test/chromedriver/run_buildbot_steps.py
+++ b/chrome/test/chromedriver/run_buildbot_steps.py
@@ -8,7 +8,9 @@
 import optparse
 import os
 import subprocess
+import shutil
 import sys
+import tempfile
 import urllib2
 import zipfile
 
@@ -130,6 +132,29 @@ def MaybeRelease(revision):
       print '@@@STEP_FAILURE@@@'
 
 
+def KillChromes():
+  chrome_map = {
+      'win': 'chrome.exe',
+      'mac': 'Chromium',
+      'linux': 'chrome',
+  }
+  if util.IsWindows():
+    cmd = ['taskkill', '/F', '/IM']
+  else:
+    cmd = ['pkill', '-9']
+  cmd.append(chrome_map[util.GetPlatformName()])
+  util.RunCommand(cmd)
+
+
+def CleanTmpDir():
+  tmp_dir = tempfile.gettempdir()
+  print 'cleaning temp directory:', tmp_dir
+  for file_name in os.listdir(tmp_dir):
+    if os.path.isdir(os.path.join(tmp_dir, file_name)):
+      print 'deleting sub-directory', file_name
+      shutil.rmtree(os.path.join(tmp_dir, file_name), True)
+
+
 def main():
   parser = optparse.OptionParser()
   parser.add_option(
@@ -140,6 +165,10 @@ def main():
       help='Chromium revision')
   options, _ = parser.parse_args()
 
+  if not options.android_package:
+    KillChromes()
+  CleanTmpDir()
+
   if options.android_package:
     Download()
   else: