[M50] Reject dashes from GrAADFR
[M50] Reject dashes from GrAADFR

Cherry-pick of 6266dca7a7a991634d144cbc3a2c6cffefd67454 into chrome/m50.

BUG=chromium:591424
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1784493004

Review URL: https://codereview.chromium.org/1784493004
NOTREECHECKS=true
NOTRY=true
NOPRESUBMIT=true
TBR=bsalomon@google.com

Review URL: https://codereview.chromium.org/1802863002

aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,Hikari-no-Tenshi/android_external_skia,Hikari-no-Tenshi/android_external_skia,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,Hikari-no-Tenshi/android_external_skia,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,Hikari-no-Tenshi/android_external_skia,aosp-mirror/platform_external_skia,Hikari-no-Tenshi/android_external_skia