Change hairline pathrenderer to avoid vertex buffer reads.
Change hairline pathrenderer to avoid vertex buffer reads.

Makes add_quads iterative rather than recursive, and uses
a secondary buffer to handle vertex processing before
writing out to the vertex buffer.

Change-Id: I26606a34b7bfea2dc9c32d7b4ed4651d633e78a2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/303021
Reviewed-by: Brian Salomon <61fabaaf0876044aeedfd8e351e485c028d69e7b@google.com>
Commit-Queue: Jim Van Verth <509afb0bfbb23ecaaf1fb3323209f531b45e75a6@google.com>

google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia