Restore SK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS

This disables an "optimization" in Skia that appears to actually cause
a performance regression. After looking, that optimization is probably
unnecessary, and will probably be removed. To facilitate that, this CL
switches it off so we can rebaseline the affected layout tests.

Effectively reverts:
https://chromium-review.googlesource.com/c/chromium/src/+/1334230

Bug: chromium:908566
Change-Id: I634814dabaed09b7f93390f7f4d5fba499317185
Reviewed-on: https://chromium-review.googlesource.com/c/1351761
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612252}
25 files changed