Roll Skia from a70445f40898 to 4ed6947787e7 (9 revisions)

https://skia.googlesource.com/skia.git/+log/a70445f40898..4ed6947787e7

2020-08-11 johnstiles@google.com Avoid recomputing the input texel colors in Processor tests.
2020-08-11 scroggo@google.com GrVkTypes: Change externalFormat to be uint64_t
2020-08-11 mtklein@google.com add SkRRect::readFromMemory() fuzzer
2020-08-11 mtklein@google.com robustify SkScaleToSides::AdjustRadii()
2020-08-11 johnstiles@google.com Update the inliner's variable mapper to use unordered_map.
2020-08-11 jlavrova@google.com ICU: SkShaper (bidi iterator only)
2020-08-11 elliotevans@google.com Add path rendering performance demo to demos.skia.org
2020-08-11 adlai@google.com Reland "Migrate MakeCrossContextFromPixmap to GrDirectContext"
2020-08-11 johnstiles@google.com Add `dumpTreeInfo` debug method to GrFragmentProcessor.

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 fmalita@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: fmalita@google.com
Change-Id: Iba5b49a306952acd808053089060004eedbfb186
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2349927Reviewed-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@{#797062}

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': 'a70445f40898fd0c48e5ccb86be2403c9ea0897a',
+  'skia_revision': '4ed6947787e7587995dbda777cd44031c59d11ad',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.