make gs_utils.py class-based, so credentials file can be read just once

BUG=skia:2618
R=rmistry@google.com

Review URL: https://codereview.chromium.org/385013004
1 file changed
tree: 96cac31aa4ff98fc400f4ca3ba5a906927ec4ccf
  1. py/
  2. third_party/
  3. .gitignore
  4. __init__.py
  5. codereview.settings
  6. DEPS
  7. PRESUBMIT.py
  8. README