Roll Skia from a6bff0c3446b to b64c26d56b1b (10 revisions)

https://skia.googlesource.com/skia.git/+log/a6bff0c3446b..b64c26d56b1b

2021-01-26 reed@google.com Don't copy when we can copy+and+transform at once
2021-01-26 johnstiles@google.com Add tests for int overloads of various intrinsics.
2021-01-26 bungeman@google.com Fix leak of X window title.
2021-01-26 tdenniston@google.com [svg] Add light source classes and lighting-color pres attr
2021-01-26 johnstiles@google.com Revert "Add SkSL for-loop control flow test to dm."
2021-01-26 johnstiles@google.com Fix GLSL/Metal codegen of unbraced empty blocks.
2021-01-26 bsalomon@google.com Reland "Write pixels goes through GrRenderTask system."
2021-01-26 csmartdalton@google.com Rewrite GrPathTessellateOp without inner fan triangulation
2021-01-26 robertphillips@google.com Remove handleDirtyContext calls from backends for which they don't make sense
2021-01-26 ethannicholas@google.com Added SkSL DSL swizzles

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 nifong@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/+doc/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
Cq-Do-Not-Cancel-Tryjobs: true
Bug: None
Tbr: nifong@google.com
Change-Id: I40ee89e05fdff9bf59ee153d34e4c1950ea0e732
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2651146


Reviewed-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@{#847430}