run_isolated.py: install CIPD packages

client/utils/tools.py

Index: client/utils/tools.py
diff --git a/client/utils/tools.py b/client/utils/tools.py
index ab9a492c921f6226168d4db2da99ef2fe715b8fe..823ae51e111fc06a6073f97ed03c7774fcf0827a 100644
--- a/client/utils/tools.py
+++ b/client/utils/tools.py
@@ -316,3 +316,14 @@ def get_cacerts_bundle():
     # to current directory instead. We use our own bundled copy of cacert.pem.
     _ca_certs = zip_package.extract_resource(utils, 'cacert.pem', temp_dir='.')
     return _ca_certs
+
+
+def sliding_timeout(timeout):
+  """Returns a function that returns how much time left till (now+timeout).
+
+  If timeout is None, the returned function always returns None.
+  """
+  if timeout is None:
+    return lambda: None
+  deadline = time.time() + timeout
+  return lambda: deadline - time.time()