Keeping asserts in release.

We have a bug that is showing up occasionally in Canary.
I want to see if these asserts could provide insight into why the bug
happens.

BUG=643845
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2342903003

Review-Url: https://codereview.chromium.org/2342903003
1 file changed