Roll Skia from 647a9bd7c253 to 7b97b3cb2bd0 (6 revisions)

https://skia.googlesource.com/skia.git/+log/647a9bd7c253..7b97b3cb2bd0

2020-09-23 adlai@google.com Reland "Migrate metal tools away from GrContext"
2020-09-23 csmartdalton@google.com Merge joins into the same tessellation patch as their following stroke
2020-09-23 csmartdalton@google.com Add an "allPathsVolatile" option for testing
2020-09-23 johnstiles@google.com Bring back the harness from SkSLGLSLTest as a testbed for debugging.
2020-09-23 csmartdalton@google.com Fail the "tess_segs_5" tests if Skia doesn't actually give us 5 tessellation segments
2020-09-23 brianosman@google.com Remove fRootSymbolTable from IR Generator

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/+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: csmartdalton@google.com
Change-Id: Iab4099e4c8d1266164866b537ca1aff393ec4dbb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2427228Reviewed-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@{#809980}

DEPS

@@ -195,7 +195,7 @@ 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': '647a9bd7c253140cb93c04d0741cdc71c3c7faf3',
+  'skia_revision': '7b97b3cb2bd0e51954655ab71ad7daaa44f68e2e',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.