SkPDF: Use fewer complex PathOps to speed up clipping
SkPDF: Use fewer complex PathOps to speed up clipping

Test from bug is 200x faster

Bug: chromium:947381
Change-Id: Ie3fc38d2b39cb8d8fc70d388a25464fcbb1eaa54
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/206166
Auto-Submit: Hal Canary <fd9641b23487c8ee78406c27513624c460600766@google.com>
Reviewed-by: Ben Wagner <53965154ffeecc4a10886eab9259e95965f2979a@google.com>
Commit-Queue: Hal Canary <fd9641b23487c8ee78406c27513624c460600766@google.com>

HalCanary/skia-hc,google/skia,google/skia,rubenvb/skia,google/skia,google/skia,google/skia,google/skia,rubenvb/skia,HalCanary/skia-hc,HalCanary/skia-hc,rubenvb/skia,rubenvb/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,HalCanary/skia-hc,rubenvb/skia,rubenvb/skia,rubenvb/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,rubenvb/skia,rubenvb/skia,aosp-mirror/platform_external_skia,HalCanary/skia-hc,google/skia,HalCanary/skia-hc,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,HalCanary/skia-hc,HalCanary/skia-hc,rubenvb/skia,google/skia