Check and report FreeType error.

BUG=chromium:648959

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4685

Change-Id: Ibc3cd5ddf37926accf1b7bf0959668510de903a8
Reviewed-on: https://skia-review.googlesource.com/4685
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Ben Wagner <bungeman@google.com>
1 file changed