[Android] Move Xvfb and TimeProfile from run_tests.py into individual files.

build/android/pylib/utils/time_profile.py

Index: build/android/pylib/utils/time_profile.py
diff --git a/build/android/pylib/utils/time_profile.py b/build/android/pylib/utils/time_profile.py
new file mode 100644
index 0000000000000000000000000000000000000000..45da7ff3af7df607d2938cde9fa8ee2d9fa24e2c
--- /dev/null
+++ b/build/android/pylib/utils/time_profile.py
@@ -0,0 +1,26 @@
+# Copyright (c) 2013 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.
+
+import logging
+import time
+
+
+class TimeProfile(object):
+  """Class for simple profiling of action, with logging of cost."""
+
+  def __init__(self, description):
+    self._starttime = None
+    self._description = description
+    self.Start()
+
+  def Start(self):
+    self._starttime = time.time()
+
+  def Stop(self):
+    """Stop profiling and dump a log."""
+    if self._starttime:
+      stoptime = time.time()
+      logging.info('%fsec to perform %s',
+                   stoptime - self._starttime, self._description)
+      self._starttime = None