GrAuditTrail can now be enabled/disabled at runtime
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1712753002

TBR=bsalomon@google.com
Doesn't actually change the public API

Review URL: https://codereview.chromium.org/1712753002
5 files changed