Roll src/third_party/skia 6d3bc2951dd6..afbf2aa737c8 (18 commits)

https://skia.googlesource.com/skia.git/+log/6d3bc2951dd6..afbf2aa737c8

git log 6d3bc2951dd6..afbf2aa737c8 --date=short --first-parent --format='%ad %ae %s'
2020-04-06 csmartdalton@google.com Revert "Reland "Reland "Reland "Use glDraw.*BaseInstance calls to avoid deferred buffer binding""""
2020-04-06 csmartdalton@google.com Revert "Remove GrGLGpu mirror methods of GL draw calls"
2020-04-06 csmartdalton@google.com Revert "Rename instanceAttribSupport -> drawInstancedSupport"
2020-04-06 mtklein@google.com make gUseSkVMBlitter take over sprite draws
2020-04-06 michaelludwig@google.com Use round for morphology radius
2020-04-06 westont@google.com Modify Linux Mesa driver script for Debian 10. Will update VERSION when switching jobs to Debian10.
2020-04-06 mtklein@google.com full clamp in clip_color
2020-04-06 reed@google.com virtual for saveCamera
2020-04-06 brianosman@google.com Add usage field to SkVertices::Attribute
2020-04-06 reed@google.com simplify some HSL blend modes in skvm
2020-04-06 mtklein@google.com basic runtime color filters on skvm
2020-04-06 kjlubick@google.com [canvaskit] Handle 4x4 matrix passing ourselves.
2020-04-06 ethannicholas@google.com Tracking uniform ownership
2020-04-06 csmartdalton@google.com Rename instanceAttribSupport -> drawInstancedSupport
2020-04-06 csmartdalton@google.com Remove GrGLGpu mirror methods of GL draw calls
2020-04-06 csmartdalton@google.com Reland "Reland "Reland "Use glDraw.*BaseInstance calls to avoid deferred buffer binding"""
2020-04-06 mtklein@google.com first sksl on skvm
2020-04-06 reed@google.com clean up public m44 and camera api

Created with:
  gclient setdep -r src/third_party/skia@afbf2aa737c8

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-autoroll
Please CC csmartdalton@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux-blink-rel;luci.chromium.try:linux-chromeos-compile-dbg;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Bug: None
Tbr: csmartdalton@google.com
Change-Id: I3126b3f9721406c8e69b777e290d536a367367d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138455Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#756888}

DEPS

@@ -175,7 +175,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': '6d3bc2951dd61e25752a7370b56880222517654e',
+  'skia_revision': 'afbf2aa737c8f0b48dfa28c88c51f56a46d32843',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.