remote_run: use /b as base directory for temporary files when available

scripts/common/chromium_utils.py

Index: scripts/common/chromium_utils.py
diff --git a/scripts/common/chromium_utils.py b/scripts/common/chromium_utils.py
index 8dd27ef8adf9ea913501b72ad6583b6c2da2d10b..75822b7b74787137aa38f766d0d5b9b238467d22 100644
--- a/scripts/common/chromium_utils.py
+++ b/scripts/common/chromium_utils.py
@@ -812,9 +812,10 @@ def FindUpwardParent(start_dir, *desired_list):
                          (desired_path, start_dir))
     found_path = os.path.join(cur_dir, desired_path)
   # Strip the entire original desired path from the end of the one found
-  # and remove a trailing path separator, if present.
+  # and remove a trailing path separator, if present (unless it's
+  # filesystem/drive root).
   found_path = found_path[:len(found_path) - len(desired_path)]
-  if found_path.endswith(os.sep):
+  if found_path.endswith(os.sep) and os.path.dirname(found_path) != found_path:

[estaab, 2016/06/14 16:57:36]

This changes the behavior of this function so if someone was depending on it to
return the root when the path wasn't found it will break now, so perhaps watch
for breakage after this goes in.

[Paweł Hajdan Jr., 2016/06/15 07:59:10]

Yup. FWIW, Windows might also be funny - I'll definitely watch out. Landing this
early my local time.

     found_path = found_path[:len(found_path) - 1]
   return found_path