upload_dir_contents(): upload multiple files in parallel

BUG=skia:2780
R=borenet@google.com

Review URL: https://codereview.chromium.org/424553002
2 files changed
tree: ca332aa38cc8ee38227b57dfb014551e248ddf23
  1. py/
  2. third_party/
  3. .gitignore
  4. __init__.py
  5. codereview.settings
  6. DEPS
  7. PRESUBMIT.py
  8. README