Revert of Remove gpu support for willUseHWAALines. (https://codereview.chromium.org/423943003/)

Reason for revert:
Breaking windows 7 compare gm's

Original issue's description:
> Remove gpu support for willUseHWAALines.
>
> By removing willUseHWAALines, we also no long reference the blend opt flag kDisableBlend so it has been removed
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/e6dfba868c19b00562f8c733b9bf37dd4ec9e68c

R=bsalomon@google.com
TBR=bsalomon@google.com
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Author: egdaniel@google.com

Review URL: https://codereview.chromium.org/430493003
8 files changed