Add isolate_android_sdk.py script and android_sdk_hash

BUG=skia:5298
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1975893002

Review-Url: https://codereview.chromium.org/1975893002
3 files changed