Reland "Remove gpu buffer reads from default path renderer."
Reland "Remove gpu buffer reads from default path renderer."

This reverts commit 30b355a49e120d7aef70ce454b6bd4c58ff97ce6.

Reason for revert: relanding with fix

Original change's description:
> Revert "Remove gpu buffer reads from default path renderer."
>
> This reverts commit 64241b8edb4dddaec62b78f3d722c7e56364d869.
>
> Reason for revert: hitting new assert on starting point
>
> Original change's description:
> > Remove gpu buffer reads from default path renderer.
> >
> > I don't actually expect to see much perf gain from this one because the
> > reads happen when we've run out of space in our vertex buffer and need
> > a new allocation. So they happen pretty rarely.
> >
> > Change-Id: Iabe2e7cebf363659180409075a1a7fc6c03d0a22
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/364618
> > Commit-Queue: Greg Daniel <39df0a804564ccb6cf75f18db79653821f37c1c5@google.com>
> > Reviewed-by: Chris Dalton <csmartdalton@google.com>
>
> TBR=39df0a804564ccb6cf75f18db79653821f37c1c5@google.com,csmartdalton@google.com
>
> Change-Id: I4c160ee692222f7c64cc63db2044fdc958eae551
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/365482
> Reviewed-by: Greg Daniel <39df0a804564ccb6cf75f18db79653821f37c1c5@google.com>
> Commit-Queue: Greg Daniel <39df0a804564ccb6cf75f18db79653821f37c1c5@google.com>

TBR=39df0a804564ccb6cf75f18db79653821f37c1c5@google.com,csmartdalton@google.com

# Not skipping CQ checks because this is a reland.

Change-Id: I97d613ca9adef0d425cc5ab22923d95297ca0afe
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/365486
Reviewed-by: Greg Daniel <39df0a804564ccb6cf75f18db79653821f37c1c5@google.com>
Commit-Queue: Greg Daniel <39df0a804564ccb6cf75f18db79653821f37c1c5@google.com>

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