Fix ASAN errors.

These errors occur when building for GPU but running dm with --nogpu. The current ASAN bots do not catch these because 1) the CPU bot compiles with skia_gpu=0 and 2) the GPU bot runs with --nocpu; whereas the new ASAN bots use the same compile for both the CPU and GPU bots.

BUG=skia:5157
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1953473002

Review-Url: https://codereview.chromium.org/1953473002
2 files changed