Port Skia recipe to normal Python scripts, move to Skia repo

BUG=skia:4763
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1703663002

Review URL: https://codereview.chromium.org/1703663002
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 326caad..df2b573 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -85,6 +85,7 @@
       'R0201',  # Method could be a function.
       'E1003',  # Using class name in super.
       'W0613',  # Unused argument.
+      'W0105',  # String statement has no effect.
   )
   # Run Pylint on only the modified python files. Unfortunately it still runs
   # Pylint on the whole file instead of just the modified lines.